2181558113 has 4 divisors (see below), whose sum is σ = 2493209280. Its totient is φ = 1869906948.

The previous prime is 2181558107. The next prime is 2181558161. The reversal of 2181558113 is 3118551812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2181558113 - 2¹⁴ = 2181541729 is a prime.

It is a super-2 number, since 2×2181558113² = 9518391600792241538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2181554113) 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, 155825573 + ... + 155825586.

It is an arithmetic number, because the mean of its divisors is an integer number (623302320).

Almost surely, 2^2181558113 is an apocalyptic number.

It is an amenable number.

2181558113 is a deficient number, since it is larger than the sum of its proper divisors (311651167).

2181558113 is an equidigital number, since it uses as much as digits as its factorization.

2181558113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311651166.

The product of its digits is 9600, while the sum is 35.

The square root of 2181558113 is about 46707.1526963483. The cubic root of 2181558113 is about 1296.9470991439.

The spelling of 2181558113 in words is "two billion, one hundred eighty-one million, five hundred fifty-eight thousand, one hundred thirteen".