113431631 has 4 divisors (see below), whose sum is σ = 113757000. Its totient is φ = 113106264.

The previous prime is 113431601. The next prime is 113431639. The reversal of 113431631 is 136134311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136134311 = 89 ⋅1529599.

It is a cyclic number.

It is not a de Polignac number, because 113431631 - 2¹⁰ = 113430607 is a prime.

It is a super-2 number, since 2×113431631² = 25733469822640322, 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 = 113431597 and 113431606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113431639) 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, 162161 + ... + 162858.

It is an arithmetic number, because the mean of its divisors is an integer number (28439250).

Almost surely, 2^113431631 is an apocalyptic number.

113431631 is a deficient number, since it is larger than the sum of its proper divisors (325369).

113431631 is an equidigital number, since it uses as much as digits as its factorization.

113431631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325368.

The product of its digits is 648, while the sum is 23.

The square root of 113431631 is about 10650.4286768186. The cubic root of 113431631 is about 484.0735934698.

Adding to 113431631 its reverse (136134311), we get a palindrome (249565942).

The spelling of 113431631 in words is "one hundred thirteen million, four hundred thirty-one thousand, six hundred thirty-one".