64333331 has 2 divisors, whose sum is σ = 64333332. Its totient is φ = 64333330.

The previous prime is 64333327. The next prime is 64333349. The reversal of 64333331 is 13333346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64333331 - 2² = 64333327 is a prime.

It is a super-2 number, since 2×64333331² = 8277554955111122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 64333331.

It is not a weakly prime, because it can be changed into another prime (64333351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32166665 + 32166666.

It is an arithmetic number, because the mean of its divisors is an integer number (32166666).

Almost surely, 2^64333331 is an apocalyptic number.

64333331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64333331 is an equidigital number, since it uses as much as digits as its factorization.

64333331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 26.

The square root of 64333331 is about 8020.8061315556. The cubic root of 64333331 is about 400.6932374439.

Adding to 64333331 its reverse (13333346), we get a palindrome (77666677).

The spelling of 64333331 in words is "sixty-four million, three hundred thirty-three thousand, three hundred thirty-one".