165181199 has 2 divisors, whose sum is σ = 165181200. Its totient is φ = 165181198.

The previous prime is 165181141. The next prime is 165181207. The reversal of 165181199 is 991181561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165181199 is a prime.

It is a Sophie Germain 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 (165181109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82590599 + 82590600.

It is an arithmetic number, because the mean of its divisors is an integer number (82590600).

Almost surely, 2^165181199 is an apocalyptic number.

165181199 is a deficient number, since it is larger than the sum of its proper divisors (1).

165181199 is an equidigital number, since it uses as much as digits as its factorization.

165181199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 41.

The square root of 165181199 is about 12852.2838048341. The cubic root of 165181199 is about 548.6813578453.

The spelling of 165181199 in words is "one hundred sixty-five million, one hundred eighty-one thousand, one hundred ninety-nine".