231117919 has 4 divisors (see below), whose sum is σ = 243282040. Its totient is φ = 218953800.

The previous prime is 231117857. The next prime is 231117949. The reversal of 231117919 is 919711132.

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 231117919 - 2⁹ = 231117407 is a prime.

It is a super-2 number, since 2×231117919² = 106830984965781122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231117949) 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, 6082032 + ... + 6082069.

It is an arithmetic number, because the mean of its divisors is an integer number (60820510).

Almost surely, 2^231117919 is an apocalyptic number.

231117919 is a deficient number, since it is larger than the sum of its proper divisors (12164121).

231117919 is a wasteful number, since it uses less digits than its factorization.

231117919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12164120.

The product of its digits is 3402, while the sum is 34.

The square root of 231117919 is about 15202.5629089308. The cubic root of 231117919 is about 613.6836311856.

The spelling of 231117919 in words is "two hundred thirty-one million, one hundred seventeen thousand, nine hundred nineteen".