113131231 has 4 divisors (see below), whose sum is σ = 113531272. Its totient is φ = 112731192.

The previous prime is 113131229. The next prime is 113131253. The reversal of 113131231 is 132131311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132131311 = 13 ⋅10163947.

It is a cyclic number.

It is not a de Polignac number, because 113131231 - 2¹ = 113131229 is a prime.

It is a super-2 number, since 2×113131231² = 25597350855150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113131331) 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, 199596 + ... + 200161.

It is an arithmetic number, because the mean of its divisors is an integer number (28382818).

Almost surely, 2^113131231 is an apocalyptic number.

113131231 is a deficient number, since it is larger than the sum of its proper divisors (400041).

113131231 is an equidigital number, since it uses as much as digits as its factorization.

113131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400040.

The product of its digits is 54, while the sum is 16.

The square root of 113131231 is about 10636.3166086761. The cubic root of 113131231 is about 483.6458930623.

Adding to 113131231 its reverse (132131311), we get a palindrome (245262542).

It can be divided in two parts, 11313 and 1231, that added together give a square (12544 = 112²).

The spelling of 113131231 in words is "one hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-one".