31641631 has 16 divisors (see below), whose sum is σ = 38598400. Its totient is φ = 25334208.

The previous prime is 31641601. The next prime is 31641637. The reversal of 31641631 is 13614613.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31641631 - 2¹⁹ = 31117343 is a prime.

It is a super-2 number, since 2×31641631² = 2002385624680322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31641596 and 31641605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31641637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8080 + ... + 11338.

It is an arithmetic number, because the mean of its divisors is an integer number (2412400).

Almost surely, 2^31641631 is an apocalyptic number.

31641631 is a deficient number, since it is larger than the sum of its proper divisors (6956769).

31641631 is a wasteful number, since it uses less digits than its factorization.

31641631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3358.

The product of its digits is 1296, while the sum is 25.

The square root of 31641631 is about 5625.0894215114. The cubic root of 31641631 is about 316.2906015248.

The spelling of 31641631 in words is "thirty-one million, six hundred forty-one thousand, six hundred thirty-one".