633968639 has 2 divisors, whose sum is σ = 633968640. Its totient is φ = 633968638.

The previous prime is 633968597. The next prime is 633968717. The reversal of 633968639 is 936869336.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 633968639 - 2¹² = 633964543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633968939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316984319 + 316984320.

It is an arithmetic number, because the mean of its divisors is an integer number (316984320).

Almost surely, 2^633968639 is an apocalyptic number.

633968639 is a deficient number, since it is larger than the sum of its proper divisors (1).

633968639 is an equidigital number, since it uses as much as digits as its factorization.

633968639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 53.

The square root of 633968639 is about 25178.7338641164. The cubic root of 633968639 is about 859.0582077908.

The spelling of 633968639 in words is "six hundred thirty-three million, nine hundred sixty-eight thousand, six hundred thirty-nine".