631933897 has 4 divisors (see below), whose sum is σ = 722210176. Its totient is φ = 541657620.

The previous prime is 631933889. The next prime is 631933919. The reversal of 631933897 is 798339136.

631933897 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 631933897 - 2³ = 631933889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631933897.

It is not an unprimeable number, because it can be changed into a prime (631933097) 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, 45138129 + ... + 45138142.

It is an arithmetic number, because the mean of its divisors is an integer number (180552544).

Almost surely, 2^631933897 is an apocalyptic number.

It is an amenable number.

631933897 is a deficient number, since it is larger than the sum of its proper divisors (90276279).

631933897 is an equidigital number, since it uses as much as digits as its factorization.

631933897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90276278.

The product of its digits is 734832, while the sum is 49.

The square root of 631933897 is about 25138.2954274947. The cubic root of 631933897 is about 858.1381648025.

The spelling of 631933897 in words is "six hundred thirty-one million, nine hundred thirty-three thousand, eight hundred ninety-seven".