631905797 has 2 divisors, whose sum is σ = 631905798. Its totient is φ = 631905796.

The previous prime is 631905763. The next prime is 631905823. The reversal of 631905797 is 797509136.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334377796 + 297528001 = 18286^2 + 17249^2 .

It is a cyclic number.

It is not a de Polignac number, because 631905797 - 2⁶ = 631905733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631905397) 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, 315952898 + 315952899.

It is an arithmetic number, because the mean of its divisors is an integer number (315952899).

Almost surely, 2^631905797 is an apocalyptic number.

It is an amenable number.

631905797 is a deficient number, since it is larger than the sum of its proper divisors (1).

631905797 is an equidigital number, since it uses as much as digits as its factorization.

631905797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 357210, while the sum is 47.

The square root of 631905797 is about 25137.7365130594. The cubic root of 631905797 is about 858.1254450966.

The spelling of 631905797 in words is "six hundred thirty-one million, nine hundred five thousand, seven hundred ninety-seven".