625045991 has 2 divisors, whose sum is σ = 625045992. Its totient is φ = 625045990.

The previous prime is 625045909. The next prime is 625046011. The reversal of 625045991 is 199540526.

625045991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 625045991 - 2²² = 620851687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625045691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312522995 + 312522996.

It is an arithmetic number, because the mean of its divisors is an integer number (312522996).

Almost surely, 2^625045991 is an apocalyptic number.

625045991 is a deficient number, since it is larger than the sum of its proper divisors (1).

625045991 is an equidigital number, since it uses as much as digits as its factorization.

625045991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 625045991 is about 25000.9198030792. The cubic root of 625045991 is about 855.0089444250.

The spelling of 625045991 in words is "six hundred twenty-five million, forty-five thousand, nine hundred ninety-one".