2100091 has 6 divisors (see below), whose sum is σ = 2443020. Its totient is φ = 1800036.

The previous prime is 2100079. The next prime is 2100097. The reversal of 2100091 is 1900012.

It is not a de Polignac number, because 2100091 - 2⁷ = 2099963 is a prime.

It is a Duffinian number.

2100091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2100097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21381 + ... + 21478.

It is an arithmetic number, because the mean of its divisors is an integer number (407170).

2^2100091 is an apocalyptic number.

2100091 is a deficient number, since it is larger than the sum of its proper divisors (342929).

2100091 is an equidigital number, since it uses as much as digits as its factorization.

2100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42873 (or 42866 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2100091 is about 1449.1690722618. The cubic root of 2100091 is about 128.0597661975.

The spelling of 2100091 in words is "two million, one hundred thousand, ninety-one".