16165009 has 4 divisors (see below), whose sum is σ = 18474304. Its totient is φ = 13855716.

The previous prime is 16165001. The next prime is 16165031. The reversal of 16165009 is 90056161.

16165009 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16165009 - 2³ = 16165001 is a prime.

It is a super-2 number, since 2×16165009² = 522615031940162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16165001) 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, 1154637 + ... + 1154650.

It is an arithmetic number, because the mean of its divisors is an integer number (4618576).

Almost surely, 2^16165009 is an apocalyptic number.

It is an amenable number.

16165009 is a deficient number, since it is larger than the sum of its proper divisors (2309295).

16165009 is an equidigital number, since it uses as much as digits as its factorization.

16165009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309294.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 16165009 is about 4020.5732178385. The cubic root of 16165009 is about 252.8474920204.

It can be divided in two parts, 16 and 165009, that added together give a triangular number (165025 = T₅₇₄).

The spelling of 16165009 in words is "sixteen million, one hundred sixty-five thousand, nine".