64719931 has 2 divisors, whose sum is σ = 64719932. Its totient is φ = 64719930.

The previous prime is 64719917. The next prime is 64719973. The reversal of 64719931 is 13991746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64719931 - 2⁷ = 64719803 is a prime.

It is a super-2 number, since 2×64719931² = 8377338937289522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64719911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32359965 + 32359966.

It is an arithmetic number, because the mean of its divisors is an integer number (32359966).

Almost surely, 2^64719931 is an apocalyptic number.

64719931 is a deficient number, since it is larger than the sum of its proper divisors (1).

64719931 is an equidigital number, since it uses as much as digits as its factorization.

64719931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 64719931 is about 8044.8698560014. The cubic root of 64719931 is about 401.4942672128.

The spelling of 64719931 in words is "sixty-four million, seven hundred nineteen thousand, nine hundred thirty-one".