2158161 has 16 divisors (see below), whose sum is σ = 2980800. Its totient is φ = 1388288.

The previous prime is 2158157. The next prime is 2158171. The reversal of 2158161 is 1618512.

2158161 = T₅₈ + T₅₉ + ... + T₂₃₅.

It is a cyclic number.

It is not a de Polignac number, because 2158161 - 2² = 2158157 is a prime.

It is a super-3 number, since 3×2158161³ = 30155933380286181843, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2158171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15685 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (186300).

2^2158161 is an apocalyptic number.

It is an amenable number.

2158161 is a deficient number, since it is larger than the sum of its proper divisors (822639).

2158161 is a wasteful number, since it uses less digits than its factorization.

2158161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288.

The product of its digits is 480, while the sum is 24.

The square root of 2158161 is about 1469.0680719422. The cubic root of 2158161 is about 129.2293857507.

The spelling of 2158161 in words is "two million, one hundred fifty-eight thousand, one hundred sixty-one".