51351531337391 has 2 divisors, whose sum is σ = 51351531337392. Its totient is φ = 51351531337390.

The previous prime is 51351531337297. The next prime is 51351531337433. The reversal of 51351531337391 is 19373313515315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51351531337391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51351531337291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675765668695 + 25675765668696.

It is an arithmetic number, because the mean of its divisors is an integer number (25675765668696).

Almost surely, 2^{51351531337391} is an apocalyptic number.

51351531337391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51351531337391 is an equidigital number, since it uses as much as digits as its factorization.

51351531337391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1913625, while the sum is 50.

The spelling of 51351531337391 in words is "fifty-one trillion, three hundred fifty-one billion, five hundred thirty-one million, three hundred thirty-seven thousand, three hundred ninety-one".