625404131591 has 2 divisors, whose sum is σ = 625404131592. Its totient is φ = 625404131590.

The previous prime is 625404131507. The next prime is 625404131617. The reversal of 625404131591 is 195131404526.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625404131591 is a prime.

It is a super-2 number, since 2×625404131591² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625404101591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312702065795 + 312702065796.

It is an arithmetic number, because the mean of its divisors is an integer number (312702065796).

Almost surely, 2^625404131591 is an apocalyptic number.

625404131591 is a deficient number, since it is larger than the sum of its proper divisors (1).

625404131591 is an equidigital number, since it uses as much as digits as its factorization.

625404131591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 625404131591 in words is "six hundred twenty-five billion, four hundred four million, one hundred thirty-one thousand, five hundred ninety-one".