64397831 has 2 divisors, whose sum is σ = 64397832. Its totient is φ = 64397830.

The previous prime is 64397803. The next prime is 64397863. The reversal of 64397831 is 13879346.

64397831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64397831 - 2¹⁰ = 64396807 is a prime.

It is a super-2 number, since 2×64397831² = 8294161275009122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64394831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32198915 + 32198916.

It is an arithmetic number, because the mean of its divisors is an integer number (32198916).

Almost surely, 2^64397831 is an apocalyptic number.

64397831 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397831 is an equidigital number, since it uses as much as digits as its factorization.

64397831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 64397831 is about 8024.8259171150. The cubic root of 64397831 is about 400.8271031555.

The spelling of 64397831 in words is "sixty-four million, three hundred ninety-seven thousand, eight hundred thirty-one".