631384931 has 4 divisors (see below), whose sum is σ = 637894152. Its totient is φ = 624875712.

The previous prime is 631384927. The next prime is 631384961. The reversal of 631384931 is 139483136.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631384931 - 2² = 631384927 is a prime.

It is a super-2 number, since 2×631384931² = 797293862187749522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631384921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254465 + ... + 3254658.

It is an arithmetic number, because the mean of its divisors is an integer number (159473538).

Almost surely, 2^631384931 is an apocalyptic number.

631384931 is a deficient number, since it is larger than the sum of its proper divisors (6509221).

631384931 is an equidigital number, since it uses as much as digits as its factorization.

631384931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509220.

The product of its digits is 46656, while the sum is 38.

The square root of 631384931 is about 25127.3741365866. The cubic root of 631384931 is about 857.8896023306.

The spelling of 631384931 in words is "six hundred thirty-one million, three hundred eighty-four thousand, nine hundred thirty-one".