165995129 has 2 divisors, whose sum is σ = 165995130. Its totient is φ = 165995128.

The previous prime is 165995107. The next prime is 165995131. The reversal of 165995129 is 921599561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 45873529 = 10960^2 + 6773^2 .

It is an emirp because it is prime and its reverse (921599561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165995129 - 2²⁰ = 164946553 is a prime.

Together with 165995131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165995729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82997564 + 82997565.

It is an arithmetic number, because the mean of its divisors is an integer number (82997565).

Almost surely, 2^165995129 is an apocalyptic number.

It is an amenable number.

165995129 is a deficient number, since it is larger than the sum of its proper divisors (1).

165995129 is an equidigital number, since it uses as much as digits as its factorization.

165995129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218700, while the sum is 47.

The square root of 165995129 is about 12883.9096938779. The cubic root of 165995129 is about 549.5810903833.

The spelling of 165995129 in words is "one hundred sixty-five million, nine hundred ninety-five thousand, one hundred twenty-nine".