2161189 has 2 divisors, whose sum is σ = 2161190. Its totient is φ = 2161188.

The previous prime is 2161177. The next prime is 2161199. The reversal of 2161189 is 9811612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 289 = 1470^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161189 - 2⁵ = 2161157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080594 + 1080595.

It is an arithmetic number, because the mean of its divisors is an integer number (1080595).

2^2161189 is an apocalyptic number.

It is an amenable number.

2161189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161189 is an equidigital number, since it uses as much as digits as its factorization.

2161189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 28.

The square root of 2161189 is about 1470.0982960333. The cubic root of 2161189 is about 129.2897957812.

The spelling of 2161189 in words is "two million, one hundred sixty-one thousand, one hundred eighty-nine".