2081090091 has 16 divisors (see below), whose sum is σ = 2823890688. Its totient is φ = 1362900000.

The previous prime is 2081090057. The next prime is 2081090093. The reversal of 2081090091 is 1900901802.

It is not a de Polignac number, because 2081090091 - 2²⁹ = 1544219179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2081090093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144466 + ... + 158216.

It is an arithmetic number, because the mean of its divisors is an integer number (176493168).

Almost surely, 2^2081090091 is an apocalyptic number.

2081090091 is a deficient number, since it is larger than the sum of its proper divisors (742800597).

2081090091 is a wasteful number, since it uses less digits than its factorization.

2081090091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14642.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2081090091 is about 45618.9663517270. The cubic root of 2081090091 is about 1276.7238179583.

Adding to 2081090091 its reverse (1900901802), we get a palindrome (3981991893).

The spelling of 2081090091 in words is "two billion, eighty-one million, ninety thousand, ninety-one".