64931371 has 2 divisors, whose sum is σ = 64931372. Its totient is φ = 64931370.

The previous prime is 64931357. The next prime is 64931387. The reversal of 64931371 is 17313946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64931371 - 2¹³ = 64923179 is a prime.

It is not a weakly prime, because it can be changed into another prime (64931351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32465685 + 32465686.

It is an arithmetic number, because the mean of its divisors is an integer number (32465686).

Almost surely, 2^64931371 is an apocalyptic number.

64931371 is a deficient number, since it is larger than the sum of its proper divisors (1).

64931371 is an equidigital number, since it uses as much as digits as its factorization.

64931371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 64931371 is about 8058.0004343509. Note that the first 3 decimals coincide. The cubic root of 64931371 is about 401.9310191616.

The spelling of 64931371 in words is "sixty-four million, nine hundred thirty-one thousand, three hundred seventy-one".