231372191 has 4 divisors (see below), whose sum is σ = 231560472. Its totient is φ = 231183912.

The previous prime is 231372181. The next prime is 231372209. The reversal of 231372191 is 191273132.

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 231372191 - 2¹⁴ = 231355807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231372131) 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, 92285 + ... + 94758.

It is an arithmetic number, because the mean of its divisors is an integer number (57890118).

Almost surely, 2^231372191 is an apocalyptic number.

231372191 is a deficient number, since it is larger than the sum of its proper divisors (188281).

231372191 is a wasteful number, since it uses less digits than its factorization.

231372191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188280.

The product of its digits is 2268, while the sum is 29.

The square root of 231372191 is about 15210.9234104968. The cubic root of 231372191 is about 613.9086034635.

The spelling of 231372191 in words is "two hundred thirty-one million, three hundred seventy-two thousand, one hundred ninety-one".