631641969 has 40 divisors (see below), whose sum is σ = 1098757440. Its totient is φ = 354111264.

The previous prime is 631641889. The next prime is 631641979. The reversal of 631641969 is 969146136.

631641969 is a `hidden beast` number, since 631 + 6 + 4 + 1 + 9 + 6 + 9 = 666.

631641969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 631641969 - 2⁷ = 631641841 is a prime.

It is a super-2 number, since 2×631641969² = 797943154004393922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631641979) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19542 + ... + 40560.

It is an arithmetic number, because the mean of its divisors is an integer number (27468936).

Almost surely, 2^631641969 is an apocalyptic number.

It is an amenable number.

631641969 is a deficient number, since it is larger than the sum of its proper divisors (467115471).

631641969 is a wasteful number, since it uses less digits than its factorization.

631641969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21091 (or 21082 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 631641969 is about 25132.4883169176. The cubic root of 631641969 is about 858.0060026965.

The spelling of 631641969 in words is "six hundred thirty-one million, six hundred forty-one thousand, nine hundred sixty-nine".