• If ^{3} + 9 and (+1)^{3} + 9 are both divisible by a number > 1, then = 547. (For example, this happens for = 533.)

547 has 2 divisors, whose sum is σ = 548. Its totient is φ = 546.

The previous prime is 541. The next prime is 557. The reversal of 547 is 745.

It is a weak prime.

547 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 547 - 2^{7} = 419 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 9, base 11, base 15 and base 16.

It is a nialpdrome in base 13.

It is a self number, because there is not a number *n* which added to its sum of digits gives 547.

It is not a weakly prime, because it can be changed into another prime (541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273 + 274.

It is an arithmetic number, because the mean of its divisors is an integer number (274).

547 is the 14-th hex number and also the 13-th centered heptagonal number.

547 is a deficient number, since it is larger than the sum of its proper divisors (1).

547 is an equidigital number, since it uses as much as digits as its factorization.

547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140, while the sum is 16.

The square root of 547 is about 23.3880311271. The cubic root of 547 is about 8.1782887883.

It can be divided in two parts, 54 and 7, that multiplied together give a triangular number (378 = T_{27}).

The spelling of 547 in words is "five hundred forty-seven", and thus it is an aban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.847 sec. • engine limits •