64331291 has 2 divisors, whose sum is σ = 64331292. Its totient is φ = 64331290.

The previous prime is 64331287. The next prime is 64331303. The reversal of 64331291 is 19213346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64331291 - 2² = 64331287 is a prime.

It is equal to p_3803519 and since 64331291 and 3803519 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64331191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32165645 + 32165646.

It is an arithmetic number, because the mean of its divisors is an integer number (32165646).

Almost surely, 2^64331291 is an apocalyptic number.

64331291 is a deficient number, since it is larger than the sum of its proper divisors (1).

64331291 is an equidigital number, since it uses as much as digits as its factorization.

64331291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 64331291 is about 8020.6789612850. The cubic root of 64331291 is about 400.6890020922.

The spelling of 64331291 in words is "sixty-four million, three hundred thirty-one thousand, two hundred ninety-one".