631973649 has 16 divisors (see below), whose sum is σ = 887961600. Its totient is φ = 398699856.

The previous prime is 631973593. The next prime is 631973677. The reversal of 631973649 is 946379136.

It is not a de Polignac number, because 631973649 - 2⁸ = 631973393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631973598 and 631973607.

It is not an unprimeable number, because it can be changed into a prime (631973689) 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, 50392 + ... + 61670.

It is an arithmetic number, because the mean of its divisors is an integer number (55497600).

Almost surely, 2^631973649 is an apocalyptic number.

It is an amenable number.

631973649 is a deficient number, since it is larger than the sum of its proper divisors (255987951).

631973649 is a wasteful number, since it uses less digits than its factorization.

631973649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12284.

The product of its digits is 734832, while the sum is 48.

The square root of 631973649 is about 25139.0860812401. The cubic root of 631973649 is about 858.1561582420.

The spelling of 631973649 in words is "six hundred thirty-one million, nine hundred seventy-three thousand, six hundred forty-nine".