631085901 has 4 divisors (see below), whose sum is σ = 841447872. Its totient is φ = 420723932.

The previous prime is 631085887. The next prime is 631085909. The reversal of 631085901 is 109580136.

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 a cyclic number.

It is not a de Polignac number, because 631085901 - 2⁶ = 631085837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631085909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105180981 + ... + 105180986.

It is an arithmetic number, because the mean of its divisors is an integer number (210361968).

Almost surely, 2^631085901 is an apocalyptic number.

It is an amenable number.

631085901 is a deficient number, since it is larger than the sum of its proper divisors (210361971).

631085901 is a wasteful number, since it uses less digits than its factorization.

631085901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210361970.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 631085901 is about 25121.4231483807. The cubic root of 631085901 is about 857.7541460107.

The spelling of 631085901 in words is "six hundred thirty-one million, eighty-five thousand, nine hundred one".