165355291 has 2 divisors, whose sum is σ = 165355292. Its totient is φ = 165355290.

The previous prime is 165355261. The next prime is 165355363. The reversal of 165355291 is 192553561.

It is a weak prime.

It is an emirp because it is prime and its reverse (192553561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165355291 - 2⁷ = 165355163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165355291.

It is not a weakly prime, because it can be changed into another prime (165355241) 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, 82677645 + 82677646.

It is an arithmetic number, because the mean of its divisors is an integer number (82677646).

Almost surely, 2^165355291 is an apocalyptic number.

165355291 is a deficient number, since it is larger than the sum of its proper divisors (1).

165355291 is an equidigital number, since it uses as much as digits as its factorization.

165355291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 37.

The square root of 165355291 is about 12859.0548252972. The cubic root of 165355291 is about 548.8740502687.

The spelling of 165355291 in words is "one hundred sixty-five million, three hundred fifty-five thousand, two hundred ninety-one".