2091109091 has 2 divisors, whose sum is σ = 2091109092. Its totient is φ = 2091109090.

The previous prime is 2091109081. The next prime is 2091109127. The reversal of 2091109091 is 1909011902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091109091 - 2²⁶ = 2024000227 is a prime.

It is not a weakly prime, because it can be changed into another prime (2091109001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045554545 + 1045554546.

It is an arithmetic number, because the mean of its divisors is an integer number (1045554546).

Almost surely, 2^2091109091 is an apocalyptic number.

2091109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091109091 is an equidigital number, since it uses as much as digits as its factorization.

2091109091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 2091109091 is about 45728.6462843588. The cubic root of 2091109091 is about 1278.7693842590.

The spelling of 2091109091 in words is "two billion, ninety-one million, one hundred nine thousand, ninety-one".