51206678531 has 2 divisors, whose sum is σ = 51206678532. Its totient is φ = 51206678530.

The previous prime is 51206678491. The next prime is 51206678563. The reversal of 51206678531 is 13587660215.

51206678531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51206678531 is a prime.

It is a super-2 number, since 2×51206678531² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51206678581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25603339265 + 25603339266.

It is an arithmetic number, because the mean of its divisors is an integer number (25603339266).

Almost surely, 2^51206678531 is an apocalyptic number.

51206678531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51206678531 is an equidigital number, since it uses as much as digits as its factorization.

51206678531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 51206678531 in words is "fifty-one billion, two hundred six million, six hundred seventy-eight thousand, five hundred thirty-one".