631712811 has 4 divisors (see below), whose sum is σ = 842283752. Its totient is φ = 421141872.

The previous prime is 631712801. The next prime is 631712813. The reversal of 631712811 is 118217136.

631712811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 631712811 - 2²¹ = 629615659 is a prime.

It is a super-2 number, since 2×631712811² = 798122151163043442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631712813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105285466 + ... + 105285471.

It is an arithmetic number, because the mean of its divisors is an integer number (210570938).

Almost surely, 2^631712811 is an apocalyptic number.

631712811 is a deficient number, since it is larger than the sum of its proper divisors (210570941).

631712811 is a wasteful number, since it uses less digits than its factorization.

631712811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210570940.

The product of its digits is 2016, while the sum is 30.

The square root of 631712811 is about 25133.8976483951. The cubic root of 631712811 is about 858.0380781401.

Adding to 631712811 its reverse (118217136), we get a palindrome (749929947).

The spelling of 631712811 in words is "six hundred thirty-one million, seven hundred twelve thousand, eight hundred eleven".