2158169 has 4 divisors (see below), whose sum is σ = 2324196. Its totient is φ = 1992144.

The previous prime is 2158157. The next prime is 2158171. The reversal of 2158169 is 9618512.

2158169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 506944 + 1651225 = 712^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158169 - 2⁸ = 2157913 is a prime.

It is a super-2 number, since 2×2158169² = 9315386865122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82994 + ... + 83019.

It is an arithmetic number, because the mean of its divisors is an integer number (581049).

2^2158169 is an apocalyptic number.

It is an amenable number.

2158169 is a deficient number, since it is larger than the sum of its proper divisors (166027).

2158169 is a wasteful number, since it uses less digits than its factorization.

2158169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166026.

The product of its digits is 4320, while the sum is 32.

The square root of 2158169 is about 1469.0707947543. The cubic root of 2158169 is about 129.2295454289.

The spelling of 2158169 in words is "two million, one hundred fifty-eight thousand, one hundred sixty-nine".