2118431 has 12 divisors (see below), whose sum is σ = 2491728. Its totient is φ = 1764192.

The previous prime is 2118419. The next prime is 2118433. The reversal of 2118431 is 1348112.

2118431 = T₉₈ + T₉₉ + ... + T₂₃₈.

It is not a de Polignac number, because 2118431 - 2¹⁸ = 1856287 is a prime.

It is a super-2 number, since 2×2118431² = 8975499803522, 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 (2118433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15395 + ... + 15531.

It is an arithmetic number, because the mean of its divisors is an integer number (207644).

2^2118431 is an apocalyptic number.

2118431 is a deficient number, since it is larger than the sum of its proper divisors (373297).

2118431 is an equidigital number, since it uses as much as digits as its factorization.

2118431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 191 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 2118431 is about 1455.4830813170. The cubic root of 2118431 is about 128.4314663292.

The spelling of 2118431 in words is "two million, one hundred eighteen thousand, four hundred thirty-one".