64320331 has 2 divisors, whose sum is σ = 64320332. Its totient is φ = 64320330.

The previous prime is 64320317. The next prime is 64320337. The reversal of 64320331 is 13302346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64320331 - 2⁷ = 64320203 is a prime.

It is a super-2 number, since 2×64320331² = 8274209959899122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64320337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32160165 + 32160166.

It is an arithmetic number, because the mean of its divisors is an integer number (32160166).

Almost surely, 2^64320331 is an apocalyptic number.

64320331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64320331 is an equidigital number, since it uses as much as digits as its factorization.

64320331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 64320331 is about 8019.9956982532. The cubic root of 64320331 is about 400.6662459248. Note that the first 3 decimals are identical.

Adding to 64320331 its reverse (13302346), we get a palindrome (77622677).

The spelling of 64320331 in words is "sixty-four million, three hundred twenty thousand, three hundred thirty-one".