165327491 has 4 divisors (see below), whose sum is σ = 188945712. Its totient is φ = 141709272.

The previous prime is 165327413. The next prime is 165327497. The reversal of 165327491 is 194723561.

165327491 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 a de Polignac number, because none of the positive numbers 2^k-165327491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165327497) 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, 11809100 + ... + 11809113.

It is an arithmetic number, because the mean of its divisors is an integer number (47236428).

Almost surely, 2^165327491 is an apocalyptic number.

165327491 is a deficient number, since it is larger than the sum of its proper divisors (23618221).

165327491 is an equidigital number, since it uses as much as digits as its factorization.

165327491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23618220.

The product of its digits is 45360, while the sum is 38.

The square root of 165327491 is about 12857.9738294958. The cubic root of 165327491 is about 548.8432891246.

The spelling of 165327491 in words is "one hundred sixty-five million, three hundred twenty-seven thousand, four hundred ninety-one".