51281358831 has 12 divisors (see below), whose sum is σ = 77293642608. Its totient is φ = 32701156224.

The previous prime is 51281358803. The next prime is 51281358881. The reversal of 51281358831 is 13885318215.

51281358831 is a `hidden beast` number, since 5 + 1 + 28 + 13 + 588 + 31 = 666.

It is not a de Polignac number, because 51281358831 - 2⁶ = 51281358767 is a prime.

It is a super-2 number, since 2×51281358831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51281358881) 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, 123867810 + ... + 123868223.

It is an arithmetic number, because the mean of its divisors is an integer number (6441136884).

Almost surely, 2^51281358831 is an apocalyptic number.

51281358831 is a deficient number, since it is larger than the sum of its proper divisors (26012283777).

51281358831 is a wasteful number, since it uses less digits than its factorization.

51281358831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247736062 (or 247736059 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 51281358831 in words is "fifty-one billion, two hundred eighty-one million, three hundred fifty-eight thousand, eight hundred thirty-one".