56531 has 2 divisors, whose sum is σ = 56532. Its totient is φ = 56530.

The previous prime is 56527. The next prime is 56533. The reversal of 56531 is 13565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56531 - 2² = 56527 is a prime.

It is a super-2 number, since 2×56531² = 6391507922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 56533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28265 + 28266.

It is an arithmetic number, because the mean of its divisors is an integer number (28266).

2⁵⁶⁵³¹ is an apocalyptic number.

56531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56531 is an equidigital number, since it uses as much as digits as its factorization.

56531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 20.

The square root of 56531 is about 237.7624865280. The cubic root of 56531 is about 38.3791680265.

The spelling of 56531 in words is "fifty-six thousand, five hundred thirty-one".