631431 has 12 divisors (see below), whose sum is σ = 965952. Its totient is φ = 396096.

The previous prime is 631429. The next prime is 631453. The reversal of 631431 is 134136.

631431 is a `hidden beast` number, since 631 + 4 + 31 = 666.

It is not a de Polignac number, because 631431 - 2¹ = 631429 is a prime.

It is a super-2 number, since 2×631431² = 797410215522, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631431.

It is not an unprimeable number, because it can be changed into a prime (631471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1911 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (80496).

2⁶³¹⁴³¹ is an apocalyptic number.

631431 is a deficient number, since it is larger than the sum of its proper divisors (334521).

631431 is a wasteful number, since it uses less digits than its factorization.

631431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150 (or 4147 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 631431 is about 794.6263272759. The cubic root of 631431 is about 85.7910467127.

Adding to 631431 its reverse (134136), we get a palindrome (765567).

The spelling of 631431 in words is "six hundred thirty-one thousand, four hundred thirty-one".