631971663 has 16 divisors (see below), whose sum is σ = 867552000. Its totient is φ = 408957120.

The previous prime is 631971661. The next prime is 631971677. The reversal of 631971663 is 366179136.

It is not a de Polignac number, because 631971663 - 2¹ = 631971661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631971661) 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, 11568 + ... + 37386.

It is an arithmetic number, because the mean of its divisors is an integer number (54222000).

Almost surely, 2^631971663 is an apocalyptic number.

631971663 is a deficient number, since it is larger than the sum of its proper divisors (235580337).

631971663 is a wasteful number, since it uses less digits than its factorization.

631971663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26062.

The product of its digits is 122472, while the sum is 42.

The square root of 631971663 is about 25139.0465809664. The cubic root of 631971663 is about 858.1552593122.

The spelling of 631971663 in words is "six hundred thirty-one million, nine hundred seventy-one thousand, six hundred sixty-three".