51131115504 has 60 divisors (see below), whose sum is σ = 163538412336. Its totient is φ = 14608889856.

The previous prime is 51131115499. The next prime is 51131115533. The reversal of 51131115504 is 40551113115.

51131115504 is a `hidden beast` number, since 5 + 11 + 31 + 115 + 504 = 666.

It is a super-2 number, since 2×51131115504² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25361649 + ... + 25363664.

Almost surely, 2^51131115504 is an apocalyptic number.

It is an amenable number.

51131115504 is an abundant number, since it is smaller than the sum of its proper divisors (112407296832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51131115504 is a wasteful number, since it uses less digits than its factorization.

51131115504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50725334 (or 50725325 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 51131115504 its reverse (40551113115), we get a palindrome (91682228619).

The spelling of 51131115504 in words is "fifty-one billion, one hundred thirty-one million, one hundred fifteen thousand, five hundred four".