165090409 has 8 divisors (see below), whose sum is σ = 180954720. Its totient is φ = 149368800.

The previous prime is 165090397. The next prime is 165090413. The reversal of 165090409 is 904090561.

165090409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165090409 - 2⁵ = 165090377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165090109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33244 + ... + 37885.

It is an arithmetic number, because the mean of its divisors is an integer number (22619340).

Almost surely, 2^165090409 is an apocalyptic number.

It is an amenable number.

165090409 is a deficient number, since it is larger than the sum of its proper divisors (15864311).

165090409 is a wasteful number, since it uses less digits than its factorization.

165090409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71351.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 165090409 is about 12848.7512622823. The cubic root of 165090409 is about 548.5808138966.

The spelling of 165090409 in words is "one hundred sixty-five million, ninety thousand, four hundred nine".