2161090 has 16 divisors (see below), whose sum is σ = 3913272. Its totient is φ = 859264.

The previous prime is 2161087. The next prime is 2161121. The reversal of 2161090 is 901612.

It can be written as a sum of positive squares in 4 ways, for example, as 2024929 + 136161 = 1423^2 + 369^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1422 + ... + 2518.

2^2161090 is an apocalyptic number.

2161090 is a deficient number, since it is larger than the sum of its proper divisors (1752182).

2161090 is a wasteful number, since it uses less digits than its factorization.

2161090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 2161090 is about 1470.0646244298. The cubic root of 2161090 is about 129.2878215770.

The spelling of 2161090 in words is "two million, one hundred sixty-one thousand, ninety".