231230091 has 4 divisors (see below), whose sum is σ = 308306792. Its totient is φ = 154153392.

The previous prime is 231230009. The next prime is 231230117. The reversal of 231230091 is 190032132.

It is a happy number.

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

It is not a de Polignac number, because 231230091 - 2¹⁰ = 231229067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231230491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38538346 + ... + 38538351.

It is an arithmetic number, because the mean of its divisors is an integer number (77076698).

Almost surely, 2^231230091 is an apocalyptic number.

231230091 is a deficient number, since it is larger than the sum of its proper divisors (77076701).

231230091 is an equidigital number, since it uses as much as digits as its factorization.

231230091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77076700.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 231230091 is about 15206.2517077681. The cubic root of 231230091 is about 613.7828979536.

The spelling of 231230091 in words is "two hundred thirty-one million, two hundred thirty thousand, ninety-one".