2161099 has 4 divisors (see below), whose sum is σ = 2167960. Its totient is φ = 2154240.

The previous prime is 2161087. The next prime is 2161121. The reversal of 2161099 is 9901612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161099 - 2⁷ = 2160971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161199) 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, 2934 + ... + 3595.

It is an arithmetic number, because the mean of its divisors is an integer number (541990).

2^2161099 is an apocalyptic number.

2161099 is a deficient number, since it is larger than the sum of its proper divisors (6861).

2161099 is an equidigital number, since it uses as much as digits as its factorization.

2161099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6860.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 2161099 is about 1470.0676855166. The cubic root of 2161099 is about 129.2880010526.

The spelling of 2161099 in words is "two million, one hundred sixty-one thousand, ninety-nine".