51253215137 has 2 divisors, whose sum is σ = 51253215138. Its totient is φ = 51253215136.

The previous prime is 51253215037. The next prime is 51253215149. The reversal of 51253215137 is 73151235215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37546425361 + 13706789776 = 193769^2 + 117076^2 .

It is a cyclic number.

It is not a de Polignac number, because 51253215137 - 2²⁰ = 51252166561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51253215097 and 51253215106.

It is not a weakly prime, because it can be changed into another prime (51253215037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25626607568 + 25626607569.

It is an arithmetic number, because the mean of its divisors is an integer number (25626607569).

Almost surely, 2^51253215137 is an apocalyptic number.

It is an amenable number.

51253215137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51253215137 is an equidigital number, since it uses as much as digits as its factorization.

51253215137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 35.

The spelling of 51253215137 in words is "fifty-one billion, two hundred fifty-three million, two hundred fifteen thousand, one hundred thirty-seven".