51315317 has 2 divisors, whose sum is σ = 51315318. Its totient is φ = 51315316.

The previous prime is 51315301. The next prime is 51315359. The reversal of 51315317 is 71351315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47210641 + 4104676 = 6871^2 + 2026^2 .

It is a cyclic number.

It is not a de Polignac number, because 51315317 - 2⁴ = 51315301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51315217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25657658 + 25657659.

It is an arithmetic number, because the mean of its divisors is an integer number (25657659).

Almost surely, 2^51315317 is an apocalyptic number.

It is an amenable number.

51315317 is a deficient number, since it is larger than the sum of its proper divisors (1).

51315317 is an equidigital number, since it uses as much as digits as its factorization.

51315317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1575, while the sum is 26.

The square root of 51315317 is about 7163.4710162044. The cubic root of 51315317 is about 371.6056758314.

The spelling of 51315317 in words is "fifty-one million, three hundred fifteen thousand, three hundred seventeen".