2118231 has 24 divisors (see below), whose sum is σ = 3319680. Its totient is φ = 1347192.

The previous prime is 2118209. The next prime is 2118239. The reversal of 2118231 is 1328112.

It is not a de Polignac number, because 2118231 - 2⁹ = 2117719 is a prime.

It is a super-2 number, since 2×2118231² = 8973805138722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5400 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (138320).

2^2118231 is an apocalyptic number.

2118231 is a deficient number, since it is larger than the sum of its proper divisors (1201449).

2118231 is an equidigital number, since it uses as much as digits as its factorization.

2118231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 405 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 2118231 is about 1455.4143739843. The cubic root of 2118231 is about 128.4274244853.

The spelling of 2118231 in words is "two million, one hundred eighteen thousand, two hundred thirty-one".