51512255239 has 2 divisors, whose sum is σ = 51512255240. Its totient is φ = 51512255238.

The previous prime is 51512255219. The next prime is 51512255269. The reversal of 51512255239 is 93255221515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51512255239 - 2²¹ = 51510158087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51512255209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756127619 + 25756127620.

It is an arithmetic number, because the mean of its divisors is an integer number (25756127620).

Almost surely, 2^51512255239 is an apocalyptic number.

51512255239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512255239 is an equidigital number, since it uses as much as digits as its factorization.

51512255239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 40.

The spelling of 51512255239 in words is "fifty-one billion, five hundred twelve million, two hundred fifty-five thousand, two hundred thirty-nine".