64945931 has 2 divisors, whose sum is σ = 64945932. Its totient is φ = 64945930.

The previous prime is 64945919. The next prime is 64945939. The reversal of 64945931 is 13954946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64945931 is a prime.

It is a super-4 number, since 4×64945931⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (64945939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32472965 + 32472966.

It is an arithmetic number, because the mean of its divisors is an integer number (32472966).

Almost surely, 2^64945931 is an apocalyptic number.

64945931 is a deficient number, since it is larger than the sum of its proper divisors (1).

64945931 is an equidigital number, since it uses as much as digits as its factorization.

64945931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 64945931 is about 8058.9038336488. The cubic root of 64945931 is about 401.9610594856.

The spelling of 64945931 in words is "sixty-four million, nine hundred forty-five thousand, nine hundred thirty-one".