165528989 has 2 divisors, whose sum is σ = 165528990. Its totient is φ = 165528988.

The previous prime is 165528967. The next prime is 165529019. The reversal of 165528989 is 989825561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154803364 + 10725625 = 12442^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 165528989 - 2²⁰ = 164480413 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165528989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165528089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82764494 + 82764495.

It is an arithmetic number, because the mean of its divisors is an integer number (82764495).

Almost surely, 2^165528989 is an apocalyptic number.

It is an amenable number.

165528989 is a deficient number, since it is larger than the sum of its proper divisors (1).

165528989 is an equidigital number, since it uses as much as digits as its factorization.

165528989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 53.

The square root of 165528989 is about 12865.8069704158. The cubic root of 165528989 is about 549.0661718530.

The spelling of 165528989 in words is "one hundred sixty-five million, five hundred twenty-eight thousand, nine hundred eighty-nine".