631691853 has 16 divisors (see below), whose sum is σ = 907495680. Its totient is φ = 388540224.

The previous prime is 631691779. The next prime is 631691873. The reversal of 631691853 is 358196136.

It is a happy number.

It is not a de Polignac number, because 631691853 - 2⁸ = 631691597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631691873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150775 + ... + 154907.

It is an arithmetic number, because the mean of its divisors is an integer number (56718480).

Almost surely, 2^631691853 is an apocalyptic number.

It is an amenable number.

631691853 is a deficient number, since it is larger than the sum of its proper divisors (275803827).

631691853 is a wasteful number, since it uses less digits than its factorization.

631691853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8068.

The product of its digits is 116640, while the sum is 42.

The square root of 631691853 is about 25133.4807179587. The cubic root of 631691853 is about 858.0285891442.

The spelling of 631691853 in words is "six hundred thirty-one million, six hundred ninety-one thousand, eight hundred fifty-three".