631346557 has 2 divisors, whose sum is σ = 631346558. Its totient is φ = 631346556.

The previous prime is 631346543. The next prime is 631346563. The reversal of 631346557 is 755643136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330185241 + 301161316 = 18171^2 + 17354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631346557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631346257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315673278 + 315673279.

It is an arithmetic number, because the mean of its divisors is an integer number (315673279).

Almost surely, 2^631346557 is an apocalyptic number.

It is an amenable number.

631346557 is a deficient number, since it is larger than the sum of its proper divisors (1).

631346557 is an equidigital number, since it uses as much as digits as its factorization.

631346557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 40.

The square root of 631346557 is about 25126.6105354463. The cubic root of 631346557 is about 857.8722218490.

The spelling of 631346557 in words is "six hundred thirty-one million, three hundred forty-six thousand, five hundred fifty-seven".