113213131 has 4 divisors (see below), whose sum is σ = 113398432. Its totient is φ = 113027832.

The previous prime is 113213123. The next prime is 113213143. The reversal of 113213131 is 131312311.

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 113213131 - 2³ = 113213123 is a prime.

It is a super-2 number, since 2×113213131² = 25634426061646322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113213431) 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, 91731 + ... + 92956.

It is an arithmetic number, because the mean of its divisors is an integer number (28349608).

Almost surely, 2^113213131 is an apocalyptic number.

113213131 is a deficient number, since it is larger than the sum of its proper divisors (185301).

113213131 is an equidigital number, since it uses as much as digits as its factorization.

113213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185300.

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

The square root of 113213131 is about 10640.1659291573. The cubic root of 113213131 is about 483.7625747944.

Adding to 113213131 its reverse (131312311), we get a palindrome (244525442).

The spelling of 113213131 in words is "one hundred thirteen million, two hundred thirteen thousand, one hundred thirty-one".