231189897 has 16 divisors (see below), whose sum is σ = 312439680. Its totient is φ = 152044032.

The previous prime is 231189883. The next prime is 231189901. The reversal of 231189897 is 798981132.

It is not a de Polignac number, because 231189897 - 2²³ = 222801289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231189197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103363 + ... + 105575.

It is an arithmetic number, because the mean of its divisors is an integer number (19527480).

Almost surely, 2^231189897 is an apocalyptic number.

It is an amenable number.

231189897 is a deficient number, since it is larger than the sum of its proper divisors (81249783).

231189897 is a wasteful number, since it uses less digits than its factorization.

231189897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672.

The product of its digits is 217728, while the sum is 48.

The square root of 231189897 is about 15204.9300228577. The cubic root of 231189897 is about 613.7473319087.

The spelling of 231189897 in words is "two hundred thirty-one million, one hundred eighty-nine thousand, eight hundred ninety-seven".