64559531 has 2 divisors, whose sum is σ = 64559532. Its totient is φ = 64559530.

The previous prime is 64559527. The next prime is 64559563. The reversal of 64559531 is 13595546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64559531 - 2² = 64559527 is a prime.

It is a super-2 number, since 2×64559531² = 8335866085879922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64559581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32279765 + 32279766.

It is an arithmetic number, because the mean of its divisors is an integer number (32279766).

Almost surely, 2^64559531 is an apocalyptic number.

64559531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64559531 is an equidigital number, since it uses as much as digits as its factorization.

64559531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 38.

The square root of 64559531 is about 8034.8945854940. The cubic root of 64559531 is about 401.1623089070.

The spelling of 64559531 in words is "sixty-four million, five hundred fifty-nine thousand, five hundred thirty-one".