2118534631 has 4 divisors (see below), whose sum is σ = 2130370200. Its totient is φ = 2106699064.

The previous prime is 2118534629. The next prime is 2118534659. The reversal of 2118534631 is 1364358112.

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 2118534631 - 2¹ = 2118534629 is a prime.

It is a super-2 number, since 2×2118534631² = 8976377965492612322, 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 (2118534601) 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, 5917516 + ... + 5917873.

It is an arithmetic number, because the mean of its divisors is an integer number (532592550).

Almost surely, 2^2118534631 is an apocalyptic number.

2118534631 is a deficient number, since it is larger than the sum of its proper divisors (11835569).

2118534631 is a wasteful number, since it uses less digits than its factorization.

2118534631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11835568.

The product of its digits is 17280, while the sum is 34.

The square root of 2118534631 is about 46027.5420916651. The cubic root of 2118534631 is about 1284.3356053068.

The spelling of 2118534631 in words is "two billion, one hundred eighteen million, five hundred thirty-four thousand, six hundred thirty-one".