2156165 has 16 divisors (see below), whose sum is σ = 2851200. Its totient is φ = 1552320.

The previous prime is 2156159. The next prime is 2156171. The reversal of 2156165 is 5616512.

It is an interprime number because it is at equal distance from previous prime (2156159) and next prime (2156171).

It is not a de Polignac number, because 2156165 - 2¹² = 2152069 is a prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10736 + ... + 10934.

It is an arithmetic number, because the mean of its divisors is an integer number (178200).

2^2156165 is an apocalyptic number.

It is an amenable number.

2156165 is a deficient number, since it is larger than the sum of its proper divisors (695035).

2156165 is a wasteful number, since it uses less digits than its factorization.

2156165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 1800, while the sum is 26.

The square root of 2156165 is about 1468.3885725516. The cubic root of 2156165 is about 129.1895337015.

The spelling of 2156165 in words is "two million, one hundred fifty-six thousand, one hundred sixty-five".