251130191287 has 12 divisors (see below), whose sum is σ = 264128909616. Its totient is φ = 238319706240.

The previous prime is 251130191261. The next prime is 251130191309. The reversal of 251130191287 is 782191031152.

It is a de Polignac number, because none of the positive numbers 2^k-251130191287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251130191987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32487 + ... + 709447.

It is an arithmetic number, because the mean of its divisors is an integer number (22010742468).

Almost surely, 2^251130191287 is an apocalyptic number.

251130191287 is a deficient number, since it is larger than the sum of its proper divisors (12998718329).

251130191287 is an equidigital number, since it uses as much as digits as its factorization.

251130191287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677238 (or 677111 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 251130191287 in words is "two hundred fifty-one billion, one hundred thirty million, one hundred ninety-one thousand, two hundred eighty-seven".