51509316959 has 2 divisors, whose sum is σ = 51509316960. Its totient is φ = 51509316958.

The previous prime is 51509316941. The next prime is 51509316961. The reversal of 51509316959 is 95961390515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51509316959 - 2¹² = 51509312863 is a prime.

Together with 51509316961, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51509316959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51509316259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25754658479 + 25754658480.

It is an arithmetic number, because the mean of its divisors is an integer number (25754658480).

Almost surely, 2^51509316959 is an apocalyptic number.

51509316959 is a deficient number, since it is larger than the sum of its proper divisors (1).

51509316959 is an equidigital number, since it uses as much as digits as its factorization.

51509316959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1640250, while the sum is 53.

The spelling of 51509316959 in words is "fifty-one billion, five hundred nine million, three hundred sixteen thousand, nine hundred fifty-nine".