51678881231 has 2 divisors, whose sum is σ = 51678881232. Its totient is φ = 51678881230.

The previous prime is 51678881123. The next prime is 51678881239. The reversal of 51678881231 is 13218887615.

Together with previous prime (51678881123) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51678881231 - 2³⁰ = 50605139407 is a prime.

It is a super-2 number, since 2×51678881231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51678881231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51678881239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25839440615 + 25839440616.

It is an arithmetic number, because the mean of its divisors is an integer number (25839440616).

Almost surely, 2^51678881231 is an apocalyptic number.

51678881231 is a deficient number, since it is larger than the sum of its proper divisors (1).

51678881231 is an equidigital number, since it uses as much as digits as its factorization.

51678881231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 50.

The spelling of 51678881231 in words is "fifty-one billion, six hundred seventy-eight million, eight hundred eighty-one thousand, two hundred thirty-one".