51023151531 has 96 divisors (see below), whose sum is σ = 84457271808. Its totient is φ = 30525776640.

The previous prime is 51023151523. The next prime is 51023151533. The reversal of 51023151531 is 13515132015.

51023151531 is a `hidden beast` number, since 51 + 0 + 2 + 31 + 51 + 531 = 666.

It is not a de Polignac number, because 51023151531 - 2³ = 51023151523 is a prime.

It is a super-2 number, since 2×51023151531² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51023151495 and 51023151504.

It is not an unprimeable number, because it can be changed into a prime (51023151533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 101437426 + ... + 101437928.

It is an arithmetic number, because the mean of its divisors is an integer number (879763248).

Almost surely, 2^51023151531 is an apocalyptic number.

51023151531 is a deficient number, since it is larger than the sum of its proper divisors (33434120277).

51023151531 is a wasteful number, since it uses less digits than its factorization.

51023151531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

Adding to 51023151531 its reverse (13515132015), we get a palindrome (64538283546).

The spelling of 51023151531 in words is "fifty-one billion, twenty-three million, one hundred fifty-one thousand, five hundred thirty-one".