631315976257 has 2 divisors, whose sum is σ = 631315976258. Its totient is φ = 631315976256.

The previous prime is 631315976251. The next prime is 631315976297. The reversal of 631315976257 is 752679513136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619131348801 + 12184627456 = 786849^2 + 110384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631315976257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631315976198 and 631315976207.

It is not a weakly prime, because it can be changed into another prime (631315976251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315657988128 + 315657988129.

It is an arithmetic number, because the mean of its divisors is an integer number (315657988129).

Almost surely, 2^631315976257 is an apocalyptic number.

It is an amenable number.

631315976257 is a deficient number, since it is larger than the sum of its proper divisors (1).

631315976257 is an equidigital number, since it uses as much as digits as its factorization.

631315976257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7144200, while the sum is 55.

The spelling of 631315976257 in words is "six hundred thirty-one billion, three hundred fifteen million, nine hundred seventy-six thousand, two hundred fifty-seven".