51431213277 has 32 divisors (see below), whose sum is σ = 78854112000. Its totient is φ = 33091571520.

The previous prime is 51431213257. The next prime is 51431213329. The reversal of 51431213277 is 77231213415.

51431213277 is a `hidden beast` number, since 5 + 1 + 431 + 213 + 2 + 7 + 7 = 666.

It is not a de Polignac number, because 51431213277 - 2¹¹ = 51431211229 is a prime.

It is a super-2 number, since 2×51431213277² (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 (51431213227) 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 31 ways as a sum of consecutive naturals, for example, 2110599 + ... + 2134827.

It is an arithmetic number, because the mean of its divisors is an integer number (2464191000).

Almost surely, 2^51431213277 is an apocalyptic number.

It is an amenable number.

51431213277 is a deficient number, since it is larger than the sum of its proper divisors (27422898723).

51431213277 is a wasteful number, since it uses less digits than its factorization.

51431213277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26978 (or 26972 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The spelling of 51431213277 in words is "fifty-one billion, four hundred thirty-one million, two hundred thirteen thousand, two hundred seventy-seven".