16018009 has 4 divisors (see below), whose sum is σ = 18306304. Its totient is φ = 13729716.

The previous prime is 16018001. The next prime is 16018021. The reversal of 16018009 is 90081061.

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 16018009 - 2³ = 16018001 is a prime.

It is a super-2 number, since 2×16018009² = 513153224648162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16018001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1144137 + ... + 1144150.

It is an arithmetic number, because the mean of its divisors is an integer number (4576576).

Almost surely, 2^16018009 is an apocalyptic number.

It is an amenable number.

16018009 is a deficient number, since it is larger than the sum of its proper divisors (2288295).

16018009 is an equidigital number, since it uses as much as digits as its factorization.

16018009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288294.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 16018009 is about 4002.2504919108. The cubic root of 16018009 is about 252.0787158562.

The spelling of 16018009 in words is "sixteen million, eighteen thousand, nine".