64333631 has 2 divisors, whose sum is σ = 64333632. Its totient is φ = 64333630.

The previous prime is 64333609. The next prime is 64333721. The reversal of 64333631 is 13633346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64333631 - 2⁶ = 64333567 is a prime.

It is a super-2 number, since 2×64333631² = 8277632155288322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 64333594 and 64333603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64333331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32166815 + 32166816.

It is an arithmetic number, because the mean of its divisors is an integer number (32166816).

Almost surely, 2^64333631 is an apocalyptic number.

64333631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64333631 is an equidigital number, since it uses as much as digits as its factorization.

64333631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 29.

The square root of 64333631 is about 8020.8248328959. The cubic root of 64333631 is about 400.6938602822.

Adding to 64333631 its reverse (13633346), we get a palindrome (77966977).

The spelling of 64333631 in words is "sixty-four million, three hundred thirty-three thousand, six hundred thirty-one".