251703564131 has 2 divisors, whose sum is σ = 251703564132. Its totient is φ = 251703564130.

The previous prime is 251703564061. The next prime is 251703564193. The reversal of 251703564131 is 131465307152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251703564131 - 2²⁶ = 251636455267 is a prime.

It is a super-2 number, since 2×251703564131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251703564631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125851782065 + 125851782066.

It is an arithmetic number, because the mean of its divisors is an integer number (125851782066).

Almost surely, 2^251703564131 is an apocalyptic number.

251703564131 is a deficient number, since it is larger than the sum of its proper divisors (1).

251703564131 is an equidigital number, since it uses as much as digits as its factorization.

251703564131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 251703564131 in words is "two hundred fifty-one billion, seven hundred three million, five hundred sixty-four thousand, one hundred thirty-one".