631493641 has 2 divisors, whose sum is σ = 631493642. Its totient is φ = 631493640.

The previous prime is 631493623. The next prime is 631493651. The reversal of 631493641 is 146394136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610287616 + 21206025 = 24704^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 631493641 - 2²³ = 623105033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631493641.

It is not a weakly prime, because it can be changed into another prime (631493651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315746820 + 315746821.

It is an arithmetic number, because the mean of its divisors is an integer number (315746821).

Almost surely, 2^631493641 is an apocalyptic number.

It is an amenable number.

631493641 is a deficient number, since it is larger than the sum of its proper divisors (1).

631493641 is an equidigital number, since it uses as much as digits as its factorization.

631493641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 631493641 is about 25129.5372221615. The cubic root of 631493641 is about 857.9388358078.

The spelling of 631493641 in words is "six hundred thirty-one million, four hundred ninety-three thousand, six hundred forty-one".