165641129 has 2 divisors, whose sum is σ = 165641130. Its totient is φ = 165641128.

The previous prime is 165641093. The next prime is 165641171. The reversal of 165641129 is 921146561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165071104 + 570025 = 12848^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 165641129 - 2⁸ = 165640873 is a prime.

It is a super-3 number, since 3×165641129³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165641429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82820564 + 82820565.

It is an arithmetic number, because the mean of its divisors is an integer number (82820565).

Almost surely, 2^165641129 is an apocalyptic number.

It is an amenable number.

165641129 is a deficient number, since it is larger than the sum of its proper divisors (1).

165641129 is an equidigital number, since it uses as much as digits as its factorization.

165641129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 165641129 is about 12870.1642957656. The cubic root of 165641129 is about 549.1901347950.

The spelling of 165641129 in words is "one hundred sixty-five million, six hundred forty-one thousand, one hundred twenty-nine".