631634911971 has 32 divisors (see below), whose sum is σ = 1036736790528. Its totient is φ = 334104613920.

The previous prime is 631634911933. The next prime is 631634912021. The reversal of 631634911971 is 179119436136.

631634911971 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 631634911971 - 2¹⁰ = 631634910947 is a prime.

It is a super-2 number, since 2×631634911971² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631634912971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21077491 + ... + 21107436.

It is an arithmetic number, because the mean of its divisors is an integer number (32398024704).

Almost surely, 2^631634911971 is an apocalyptic number.

631634911971 is a deficient number, since it is larger than the sum of its proper divisors (405101878557).

631634911971 is a wasteful number, since it uses less digits than its factorization.

631634911971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42184991.

The product of its digits is 734832, while the sum is 51.

The spelling of 631634911971 in words is "six hundred thirty-one billion, six hundred thirty-four million, nine hundred eleven thousand, nine hundred seventy-one".