51504531317 has 2 divisors, whose sum is σ = 51504531318. Its totient is φ = 51504531316.

The previous prime is 51504531313. The next prime is 51504531341. The reversal of 51504531317 is 71313540515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49572577201 + 1931954116 = 222649^2 + 43954^2 .

It is a cyclic number.

It is not a de Polignac number, because 51504531317 - 2² = 51504531313 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51504531313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752265658 + 25752265659.

It is an arithmetic number, because the mean of its divisors is an integer number (25752265659).

Almost surely, 2^51504531317 is an apocalyptic number.

It is an amenable number.

51504531317 is a deficient number, since it is larger than the sum of its proper divisors (1).

51504531317 is an equidigital number, since it uses as much as digits as its factorization.

51504531317 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 35.

The spelling of 51504531317 in words is "fifty-one billion, five hundred four million, five hundred thirty-one thousand, three hundred seventeen".