51136605531 has 16 divisors (see below), whose sum is σ = 82645019520. Its totient is φ = 30991881960.

The previous prime is 51136605517. The next prime is 51136605547. The reversal of 51136605531 is 13550663115.

51136605531 is a `hidden beast` number, since 5 + 1 + 13 + 6 + 605 + 5 + 31 = 666.

It is not a de Polignac number, because 51136605531 - 2¹⁰ = 51136604507 is a prime.

It is a super-2 number, since 2×51136605531² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51136605511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86088265 + ... + 86088858.

It is an arithmetic number, because the mean of its divisors is an integer number (5165313720).

Almost surely, 2^51136605531 is an apocalyptic number.

51136605531 is a deficient number, since it is larger than the sum of its proper divisors (31508413989).

51136605531 is a wasteful number, since it uses less digits than its factorization.

51136605531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172177143 (or 172177137 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 51136605531 in words is "fifty-one billion, one hundred thirty-six million, six hundred five thousand, five hundred thirty-one".