231243187 has 16 divisors (see below), whose sum is σ = 278562240. Its totient is φ = 187754112.

The previous prime is 231243179. The next prime is 231243209. The reversal of 231243187 is 781342132.

It is not a de Polignac number, because 231243187 - 2³ = 231243179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231246187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13 + ... + 21505.

It is an arithmetic number, because the mean of its divisors is an integer number (17410140).

Almost surely, 2^231243187 is an apocalyptic number.

231243187 is a deficient number, since it is larger than the sum of its proper divisors (47319053).

231243187 is a wasteful number, since it uses less digits than its factorization.

231243187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21582.

The product of its digits is 8064, while the sum is 31.

The square root of 231243187 is about 15206.6823140355. The cubic root of 231243187 is about 613.7944851841.

The spelling of 231243187 in words is "two hundred thirty-one million, two hundred forty-three thousand, one hundred eighty-seven".