115111231 has 4 divisors (see below), whose sum is σ = 117918864. Its totient is φ = 112303600.

The previous prime is 115111229. The next prime is 115111247. The reversal of 115111231 is 132111511.

It is a happy number.

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 115111231 - 2¹ = 115111229 is a prime.

It is a super-2 number, since 2×115111231² = 26501191004670722, 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 (115111531) 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, 1403755 + ... + 1403836.

It is an arithmetic number, because the mean of its divisors is an integer number (29479716).

Almost surely, 2^115111231 is an apocalyptic number.

115111231 is a deficient number, since it is larger than the sum of its proper divisors (2807633).

115111231 is an equidigital number, since it uses as much as digits as its factorization.

115111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807632.

The product of its digits is 30, while the sum is 16.

The square root of 115111231 is about 10728.9902134357. The cubic root of 115111231 is about 486.4511481350.

Adding to 115111231 its reverse (132111511), we get a palindrome (247222742).

The spelling of 115111231 in words is "one hundred fifteen million, one hundred eleven thousand, two hundred thirty-one".