231306113 has 4 divisors (see below), whose sum is σ = 231397380. Its totient is φ = 231214848.

The previous prime is 231306109. The next prime is 231306139. The reversal of 231306113 is 311603132.

It is a happy number.

231306113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121727089 + 109579024 = 11033^2 + 10468^2 .

It is a cyclic number.

It is not a de Polignac number, because 231306113 - 2² = 231306109 is a prime.

It is a super-2 number, since 2×231306113² = 107005035822337538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231303113) 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, 41720 + ... + 46937.

It is an arithmetic number, because the mean of its divisors is an integer number (57849345).

Almost surely, 2^231306113 is an apocalyptic number.

It is an amenable number.

231306113 is a deficient number, since it is larger than the sum of its proper divisors (91267).

231306113 is an equidigital number, since it uses as much as digits as its factorization.

231306113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91266.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 231306113 is about 15208.7511979123. The cubic root of 231306113 is about 613.8501554784.

Adding to 231306113 its reverse (311603132), we get a palindrome (542909245).

The spelling of 231306113 in words is "two hundred thirty-one million, three hundred six thousand, one hundred thirteen".