625321531 has 2 divisors, whose sum is σ = 625321532. Its totient is φ = 625321530.

The previous prime is 625321513. The next prime is 625321583. The reversal of 625321531 is 135123526.

625321531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (625321513) 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 not a de Polignac number, because 625321531 - 2²³ = 616932923 is a prime.

It is a super-2 number, since 2×625321531² = 782054034264367922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 625321531.

It is not a weakly prime, because it can be changed into another prime (625381531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312660765 + 312660766.

It is an arithmetic number, because the mean of its divisors is an integer number (312660766).

Almost surely, 2^625321531 is an apocalyptic number.

625321531 is a deficient number, since it is larger than the sum of its proper divisors (1).

625321531 is an equidigital number, since it uses as much as digits as its factorization.

625321531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 625321531 is about 25006.4297931552. The cubic root of 625321531 is about 855.1345642770.

The spelling of 625321531 in words is "six hundred twenty-five million, three hundred twenty-one thousand, five hundred thirty-one".