231187 has 4 divisors (see below), whose sum is σ = 252216. Its totient is φ = 210160.

The previous prime is 231169. The next prime is 231197. The reversal of 231187 is 781132.

231187 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.

It is a cyclic number.

It is not a de Polignac number, because 231187 - 2¹¹ = 229139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231107) 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, 10498 + ... + 10519.

It is an arithmetic number, because the mean of its divisors is an integer number (63054).

2²³¹¹⁸⁷ is an apocalyptic number.

231187 is a deficient number, since it is larger than the sum of its proper divisors (21029).

231187 is a wasteful number, since it uses less digits than its factorization.

231187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21028.

The product of its digits is 336, while the sum is 22.

The square root of 231187 is about 480.8190927989. The cubic root of 231187 is about 61.3744768311.

Subtracting 231187 from its reverse (781132), we obtain a palindrome (549945).

The spelling of 231187 in words is "two hundred thirty-one thousand, one hundred eighty-seven".