2099081181 has 4 divisors (see below), whose sum is σ = 2798774912. Its totient is φ = 1399387452.

The previous prime is 2099081099. The next prime is 2099081189. The reversal of 2099081181 is 1811809902.

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 2099081181 - 2²² = 2094886877 is a prime.

It is a super-2 number, since 2×2099081181² = 8812283608856709522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099081189) 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, 349846861 + ... + 349846866.

It is an arithmetic number, because the mean of its divisors is an integer number (699693728).

Almost surely, 2^2099081181 is an apocalyptic number.

It is an amenable number.

2099081181 is a deficient number, since it is larger than the sum of its proper divisors (699693731).

2099081181 is an equidigital number, since it uses as much as digits as its factorization.

2099081181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699693730.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 2099081181 is about 45815.7307155523. The cubic root of 2099081181 is about 1280.3923725886.

The spelling of 2099081181 in words is "two billion, ninety-nine million, eighty-one thousand, one hundred eighty-one".