634920631 has 2 divisors, whose sum is σ = 634920632. Its totient is φ = 634920630.

The previous prime is 634920623. The next prime is 634920647. The reversal of 634920631 is 136029436.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634920631 - 2³ = 634920623 is a prime.

It is a super-2 number, since 2×634920631² = 806248415338876322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634920691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317460315 + 317460316.

It is an arithmetic number, because the mean of its divisors is an integer number (317460316).

Almost surely, 2^634920631 is an apocalyptic number.

634920631 is a deficient number, since it is larger than the sum of its proper divisors (1).

634920631 is an equidigital number, since it uses as much as digits as its factorization.

634920631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 634920631 is about 25197.6314561508. The cubic root of 634920631 is about 859.4879911571.

The spelling of 634920631 in words is "six hundred thirty-four million, nine hundred twenty thousand, six hundred thirty-one".