165331489 has 4 divisors (see below), whose sum is σ = 165383424. Its totient is φ = 165279556.

The previous prime is 165331487. The next prime is 165331493. The reversal of 165331489 is 984133561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984133561 = 43 ⋅22886827.

It is a cyclic number.

It is not a de Polignac number, because 165331489 - 2¹ = 165331487 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165331487) 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, 20857 + ... + 27670.

It is an arithmetic number, because the mean of its divisors is an integer number (41345856).

Almost surely, 2^165331489 is an apocalyptic number.

It is an amenable number.

165331489 is a deficient number, since it is larger than the sum of its proper divisors (51935).

165331489 is an equidigital number, since it uses as much as digits as its factorization.

165331489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51934.

The product of its digits is 77760, while the sum is 40.

The square root of 165331489 is about 12858.1292962857. The cubic root of 165331489 is about 548.8477131878.

The spelling of 165331489 in words is "one hundred sixty-five million, three hundred thirty-one thousand, four hundred eighty-nine".