165164091 has 4 divisors (see below), whose sum is σ = 220218792. Its totient is φ = 110109392.

The previous prime is 165164071. The next prime is 165164099. The reversal of 165164091 is 190461561.

165164091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165164091 - 2¹⁷ = 165033019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165164099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27527346 + ... + 27527351.

It is an arithmetic number, because the mean of its divisors is an integer number (55054698).

Almost surely, 2^165164091 is an apocalyptic number.

165164091 is a deficient number, since it is larger than the sum of its proper divisors (55054701).

165164091 is an equidigital number, since it uses as much as digits as its factorization.

165164091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55054700.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 165164091 is about 12851.6182249552. The cubic root of 165164091 is about 548.6624146790.

The spelling of 165164091 in words is "one hundred sixty-five million, one hundred sixty-four thousand, ninety-one".