2101091 has 2 divisors, whose sum is σ = 2101092. Its totient is φ = 2101090.

The previous prime is 2101067. The next prime is 2101093. The reversal of 2101091 is 1901012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101091 is a prime.

It is a Sophie Germain prime.

Together with 2101093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2101093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050545 + 1050546.

It is an arithmetic number, because the mean of its divisors is an integer number (1050546).

2^2101091 is an apocalyptic number.

2101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101091 is an equidigital number, since it uses as much as digits as its factorization.

2101091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 2101091 is about 1449.5140565031. The cubic root of 2101091 is about 128.0800890383.

The spelling of 2101091 in words is "two million, one hundred one thousand, ninety-one".