64807531 has 2 divisors, whose sum is σ = 64807532. Its totient is φ = 64807530.

The previous prime is 64807529. The next prime is 64807541. The reversal of 64807531 is 13570846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64807531 - 2¹ = 64807529 is a prime.

It is a super-2 number, since 2×64807531² = 8400032148631922, which contains 22 as substring.

Together with 64807529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64807541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32403765 + 32403766.

It is an arithmetic number, because the mean of its divisors is an integer number (32403766).

Almost surely, 2^64807531 is an apocalyptic number.

64807531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64807531 is an equidigital number, since it uses as much as digits as its factorization.

64807531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 64807531 is about 8050.3124784073. The cubic root of 64807531 is about 401.6753296303.

The spelling of 64807531 in words is "sixty-four million, eight hundred seven thousand, five hundred thirty-one".