51512351531 has 2 divisors, whose sum is σ = 51512351532. Its totient is φ = 51512351530.

The previous prime is 51512351459. The next prime is 51512351549. The reversal of 51512351531 is 13515321515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51512351531 - 2²² = 51508157227 is a prime.

It is a super-2 number, since 2×51512351531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51512357531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756175765 + 25756175766.

It is an arithmetic number, because the mean of its divisors is an integer number (25756175766).

Almost surely, 2^51512351531 is an apocalyptic number.

51512351531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512351531 is an equidigital number, since it uses as much as digits as its factorization.

51512351531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11250, while the sum is 32.

The spelling of 51512351531 in words is "fifty-one billion, five hundred twelve million, three hundred fifty-one thousand, five hundred thirty-one".