251111313431 has 6 divisors (see below), whose sum is σ = 276014914896. Its totient is φ = 228283012100.

The previous prime is 251111313407. The next prime is 251111313433. The reversal of 251111313431 is 134313111152.

It is not a de Polignac number, because 251111313431 - 2³⁰ = 250037571607 is a prime.

It is a super-2 number, since 2×251111313431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251111313431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251111313433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1037649935 + ... + 1037650176.

It is an arithmetic number, because the mean of its divisors is an integer number (46002485816).

Almost surely, 2^251111313431 is an apocalyptic number.

251111313431 is a deficient number, since it is larger than the sum of its proper divisors (24903601465).

251111313431 is a wasteful number, since it uses less digits than its factorization.

251111313431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075300133 (or 2075300122 counting only the distinct ones).

The product of its digits is 1080, while the sum is 26.

Adding to 251111313431 its reverse (134313111152), we get a palindrome (385424424583).

The spelling of 251111313431 in words is "two hundred fifty-one billion, one hundred eleven million, three hundred thirteen thousand, four hundred thirty-one".