165090911 has 4 divisors (see below), whose sum is σ = 165618672. Its totient is φ = 164563152.

The previous prime is 165090883. The next prime is 165090917. The reversal of 165090911 is 119090561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119090561 = 31 ⋅3841631.

It is a cyclic number.

It is not a de Polignac number, because 165090911 - 2⁶ = 165090847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165090917) 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 in 3 ways as a sum of consecutive naturals, for example, 263411 + ... + 264036.

It is an arithmetic number, because the mean of its divisors is an integer number (41404668).

Almost surely, 2^165090911 is an apocalyptic number.

165090911 is a deficient number, since it is larger than the sum of its proper divisors (527761).

165090911 is an equidigital number, since it uses as much as digits as its factorization.

165090911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527760.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 165090911 is about 12848.7707972397. The cubic root of 165090911 is about 548.5813699299.

The spelling of 165090911 in words is "one hundred sixty-five million, ninety thousand, nine hundred eleven".