625608631 has 2 divisors, whose sum is σ = 625608632. Its totient is φ = 625608630.

The previous prime is 625608629. The next prime is 625608647. The reversal of 625608631 is 136806526.

625608631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625608631 - 2¹ = 625608629 is a prime.

It is a super-2 number, since 2×625608631² = 782772318363388322, which contains 22 as substring.

Together with 625608629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625608601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312804315 + 312804316.

It is an arithmetic number, because the mean of its divisors is an integer number (312804316).

Almost surely, 2^625608631 is an apocalyptic number.

625608631 is a deficient number, since it is larger than the sum of its proper divisors (1).

625608631 is an equidigital number, since it uses as much as digits as its factorization.

625608631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 625608631 is about 25012.1696579885. The cubic root of 625608631 is about 855.2654151314.

The spelling of 625608631 in words is "six hundred twenty-five million, six hundred eight thousand, six hundred thirty-one".