231115109 has 4 divisors (see below), whose sum is σ = 241163616. Its totient is φ = 221066604.

The previous prime is 231115097. The next prime is 231115133. The reversal of 231115109 is 901511132.

231115109 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231115109 - 2⁸ = 231114853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 10048483 = 231115109 / (2 + 3 + 1 + 1 + 1 + 5 + 1 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231115189) 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, 5024219 + ... + 5024264.

It is an arithmetic number, because the mean of its divisors is an integer number (60290904).

Almost surely, 2^231115109 is an apocalyptic number.

It is an amenable number.

231115109 is a deficient number, since it is larger than the sum of its proper divisors (10048507).

231115109 is a wasteful number, since it uses less digits than its factorization.

231115109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10048506.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 231115109 is about 15202.4704900223. The cubic root of 231115109 is about 613.6811440598.

The spelling of 231115109 in words is "two hundred thirty-one million, one hundred fifteen thousand, one hundred nine".