51520475317 has 2 divisors, whose sum is σ = 51520475318. Its totient is φ = 51520475316.

The previous prime is 51520475291. The next prime is 51520475329. The reversal of 51520475317 is 71357402515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48862660401 + 2657814916 = 221049^2 + 51554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520475317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51520475317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51520475117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760237658 + 25760237659.

It is an arithmetic number, because the mean of its divisors is an integer number (25760237659).

Almost surely, 2^51520475317 is an apocalyptic number.

It is an amenable number.

51520475317 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520475317 is an equidigital number, since it uses as much as digits as its factorization.

51520475317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 51520475317 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, three hundred seventeen".