51311611313 has 2 divisors, whose sum is σ = 51311611314. Its totient is φ = 51311611312.

The previous prime is 51311611297. The next prime is 51311611327. The reversal of 51311611313 is 31311611315.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45654014224 + 5657597089 = 213668^2 + 75217^2 .

It is a cyclic number.

It is not a de Polignac number, because 51311611313 - 2⁴ = 51311611297 is a prime.

It is not a weakly prime, because it can be changed into another prime (51311611363) 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 as a sum of consecutive naturals, namely, 25655805656 + 25655805657.

It is an arithmetic number, because the mean of its divisors is an integer number (25655805657).

Almost surely, 2^51311611313 is an apocalyptic number.

It is an amenable number.

51311611313 is a deficient number, since it is larger than the sum of its proper divisors (1).

51311611313 is an equidigital number, since it uses as much as digits as its factorization.

51311611313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 26.

The spelling of 51311611313 in words is "fifty-one billion, three hundred eleven million, six hundred eleven thousand, three hundred thirteen".