51319809791 has 2 divisors, whose sum is σ = 51319809792. Its totient is φ = 51319809790.

The previous prime is 51319809781. The next prime is 51319809803. The reversal of 51319809791 is 19790891315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51319809791 - 2¹⁸ = 51319547647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51319809781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25659904895 + 25659904896.

It is an arithmetic number, because the mean of its divisors is an integer number (25659904896).

Almost surely, 2^51319809791 is an apocalyptic number.

51319809791 is a deficient number, since it is larger than the sum of its proper divisors (1).

51319809791 is an equidigital number, since it uses as much as digits as its factorization.

51319809791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 53.

The spelling of 51319809791 in words is "fifty-one billion, three hundred nineteen million, eight hundred nine thousand, seven hundred ninety-one".