51502251917 has 2 divisors, whose sum is σ = 51502251918. Its totient is φ = 51502251916.

The previous prime is 51502251901. The next prime is 51502251919. The reversal of 51502251917 is 71915220515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38465407876 + 13036844041 = 196126^2 + 114179^2 .

It is a cyclic number.

It is not a de Polignac number, because 51502251917 - 2⁴ = 51502251901 is a prime.

Together with 51502251919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51502251919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25751125958 + 25751125959.

It is an arithmetic number, because the mean of its divisors is an integer number (25751125959).

Almost surely, 2^51502251917 is an apocalyptic number.

It is an amenable number.

51502251917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51502251917 is an equidigital number, since it uses as much as digits as its factorization.

51502251917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 38.

The spelling of 51502251917 in words is "fifty-one billion, five hundred two million, two hundred fifty-one thousand, nine hundred seventeen".