2156161 has 8 divisors (see below), whose sum is σ = 2609280. Its totient is φ = 1739328.

The previous prime is 2156159. The next prime is 2156171. The reversal of 2156161 is 1616512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2156161 - 2¹ = 2156159 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8941 + ... + 9178.

It is an arithmetic number, because the mean of its divisors is an integer number (326160).

2^2156161 is an apocalyptic number.

It is an amenable number.

2156161 is a deficient number, since it is larger than the sum of its proper divisors (453119).

2156161 is a wasteful number, since it uses less digits than its factorization.

2156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18143.

The product of its digits is 360, while the sum is 22.

The square root of 2156161 is about 1468.3872105136. The cubic root of 2156161 is about 129.1894538130.

The spelling of 2156161 in words is "two million, one hundred fifty-six thousand, one hundred sixty-one".