625894631 has 2 divisors, whose sum is σ = 625894632. Its totient is φ = 625894630.

The previous prime is 625894613. The next prime is 625894663. The reversal of 625894631 is 136498526.

Together with previous prime (625894613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625894631 is a prime.

It is a super-2 number, since 2×625894631² = 783488178229252322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625894691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312947315 + 312947316.

It is an arithmetic number, because the mean of its divisors is an integer number (312947316).

Almost surely, 2^625894631 is an apocalyptic number.

625894631 is a deficient number, since it is larger than the sum of its proper divisors (1).

625894631 is an equidigital number, since it uses as much as digits as its factorization.

625894631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 44.

The square root of 625894631 is about 25017.8862216615. The cubic root of 625894631 is about 855.3957248447.

The spelling of 625894631 in words is "six hundred twenty-five million, eight hundred ninety-four thousand, six hundred thirty-one".