625631 has 2 divisors, whose sum is σ = 625632. Its totient is φ = 625630.

The previous prime is 625627. The next prime is 625637. The reversal of 625631 is 136526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625631 - 2² = 625627 is a prime.

It is a super-2 number, since 2×625631² = 782828296322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁵ + 2⁹ + 6⁵ + 5⁷ + 3¹² + 1 .

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 625597 and 625606.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 625631.

It is not a weakly prime, because it can be changed into another prime (625637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312815 + 312816.

It is an arithmetic number, because the mean of its divisors is an integer number (312816).

2⁶²⁵⁶³¹ is an apocalyptic number.

625631 is a deficient number, since it is larger than the sum of its proper divisors (1).

625631 is an equidigital number, since it uses as much as digits as its factorization.

625631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 23.

The square root of 625631 is about 790.9683938060. The cubic root of 625631 is about 85.5275608514.

The spelling of 625631 in words is "six hundred twenty-five thousand, six hundred thirty-one".