631742957 has 2 divisors, whose sum is σ = 631742958. Its totient is φ = 631742956.

The previous prime is 631742941. The next prime is 631742977. The reversal of 631742957 is 759247136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432057796 + 199685161 = 20786^2 + 14131^2 .

It is a cyclic number.

It is not a de Polignac number, because 631742957 - 2⁴ = 631742941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631742977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315871478 + 315871479.

It is an arithmetic number, because the mean of its divisors is an integer number (315871479).

Almost surely, 2^631742957 is an apocalyptic number.

It is an amenable number.

631742957 is a deficient number, since it is larger than the sum of its proper divisors (1).

631742957 is an equidigital number, since it uses as much as digits as its factorization.

631742957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 44.

The square root of 631742957 is about 25134.4973492608. The cubic root of 631742957 is about 858.0517267496.

The spelling of 631742957 in words is "six hundred thirty-one million, seven hundred forty-two thousand, nine hundred fifty-seven".