251520325631 has 2 divisors, whose sum is σ = 251520325632. Its totient is φ = 251520325630.

The previous prime is 251520325597. The next prime is 251520325681. The reversal of 251520325631 is 136523025152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251520325631 is a prime.

It is a super-2 number, since 2×251520325631² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251520325591 and 251520325600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251520325681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125760162815 + 125760162816.

It is an arithmetic number, because the mean of its divisors is an integer number (125760162816).

Almost surely, 2^251520325631 is an apocalyptic number.

251520325631 is a deficient number, since it is larger than the sum of its proper divisors (1).

251520325631 is an equidigital number, since it uses as much as digits as its factorization.

251520325631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 251520325631 in words is "two hundred fifty-one billion, five hundred twenty million, three hundred twenty-five thousand, six hundred thirty-one".