636124631 has 2 divisors, whose sum is σ = 636124632. Its totient is φ = 636124630.

The previous prime is 636124589. The next prime is 636124661. The reversal of 636124631 is 136421636.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636124631 is a prime.

It is a super-2 number, since 2×636124631² = 809309092329772322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636124661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318062315 + 318062316.

It is an arithmetic number, because the mean of its divisors is an integer number (318062316).

Almost surely, 2^636124631 is an apocalyptic number.

636124631 is a deficient number, since it is larger than the sum of its proper divisors (1).

636124631 is an equidigital number, since it uses as much as digits as its factorization.

636124631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 636124631 is about 25221.5112751001. The cubic root of 636124631 is about 860.0309304722.

The spelling of 636124631 in words is "six hundred thirty-six million, one hundred twenty-four thousand, six hundred thirty-one".