631701491 has 2 divisors, whose sum is σ = 631701492. Its totient is φ = 631701490.

The previous prime is 631701457. The next prime is 631701523. The reversal of 631701491 is 194107136.

It is an a-pointer prime, because the next prime (631701523) can be obtained adding 631701491 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631701491 - 2²² = 627507187 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631701401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315850745 + 315850746.

It is an arithmetic number, because the mean of its divisors is an integer number (315850746).

Almost surely, 2^631701491 is an apocalyptic number.

631701491 is a deficient number, since it is larger than the sum of its proper divisors (1).

631701491 is an equidigital number, since it uses as much as digits as its factorization.

631701491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 631701491 is about 25133.6724535035. The cubic root of 631701491 is about 858.0329528950.

The spelling of 631701491 in words is "six hundred thirty-one million, seven hundred one thousand, four hundred ninety-one".