64568531 has 2 divisors, whose sum is σ = 64568532. Its totient is φ = 64568530.

The previous prime is 64568513. The next prime is 64568557. The reversal of 64568531 is 13586546.

Together with previous prime (64568513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64568531 is a prime.

It is a super-2 number, since 2×64568531² = 8338190390995922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64568831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32284265 + 32284266.

It is an arithmetic number, because the mean of its divisors is an integer number (32284266).

Almost surely, 2^64568531 is an apocalyptic number.

64568531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64568531 is an equidigital number, since it uses as much as digits as its factorization.

64568531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 64568531 is about 8035.4546231063. The cubic root of 64568531 is about 401.1809495475.

The spelling of 64568531 in words is "sixty-four million, five hundred sixty-eight thousand, five hundred thirty-one".