231188231 has 4 divisors (see below), whose sum is σ = 234978264. Its totient is φ = 227398200.

The previous prime is 231188201. The next prime is 231188267. The reversal of 231188231 is 132881132.

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 231188231 - 2¹⁰ = 231187207 is a prime.

It is a super-2 number, since 2×231188231² = 106895996305818722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231188194 and 231188203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231188201) 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, 1894925 + ... + 1895046.

It is an arithmetic number, because the mean of its divisors is an integer number (58744566).

Almost surely, 2^231188231 is an apocalyptic number.

231188231 is a deficient number, since it is larger than the sum of its proper divisors (3790033).

231188231 is an equidigital number, since it uses as much as digits as its factorization.

231188231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790032.

The product of its digits is 2304, while the sum is 29.

The square root of 231188231 is about 15204.8752378966. The cubic root of 231188231 is about 613.7458576437.

The spelling of 231188231 in words is "two hundred thirty-one million, one hundred eighty-eight thousand, two hundred thirty-one".