51297831557331 has 4 divisors (see below), whose sum is σ = 68397108743112. Its totient is φ = 34198554371552.

The previous prime is 51297831557311. The next prime is 51297831557333. The reversal of 51297831557331 is 13375513879215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51297831557331 - 2⁹ = 51297831556819 is a prime.

It is a super-2 number, since 2×51297831557331² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51297831557333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8549638592886 + ... + 8549638592891.

It is an arithmetic number, because the mean of its divisors is an integer number (17099277185778).

Almost surely, 2^{51297831557331} is an apocalyptic number.

51297831557331 is a deficient number, since it is larger than the sum of its proper divisors (17099277185781).

51297831557331 is a wasteful number, since it uses less digits than its factorization.

51297831557331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17099277185780.

The product of its digits is 23814000, while the sum is 60.

The spelling of 51297831557331 in words is "fifty-one trillion, two hundred ninety-seven billion, eight hundred thirty-one million, five hundred fifty-seven thousand, three hundred thirty-one".