2165872139 has 2 divisors, whose sum is σ = 2165872140. Its totient is φ = 2165872138.

The previous prime is 2165872127. The next prime is 2165872147. The reversal of 2165872139 is 9312785612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165872139 - 2²⁴ = 2149094923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165872139.

It is not a weakly prime, because it can be changed into another prime (2165872169) 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 as a sum of consecutive naturals, namely, 1082936069 + 1082936070.

It is an arithmetic number, because the mean of its divisors is an integer number (1082936070).

Almost surely, 2^2165872139 is an apocalyptic number.

2165872139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165872139 is an equidigital number, since it uses as much as digits as its factorization.

2165872139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 2165872139 is about 46538.9314338007. The cubic root of 2165872139 is about 1293.8311559505.

The spelling of 2165872139 in words is "two billion, one hundred sixty-five million, eight hundred seventy-two thousand, one hundred thirty-nine".