16598009 has 4 divisors (see below), whose sum is σ = 16623204. Its totient is φ = 16572816.

The previous prime is 16597991. The next prime is 16598017. The reversal of 16598009 is 90089561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90089561 = 37 ⋅2434853.

It can be written as a sum of positive squares in 2 ways, for example, as 11580409 + 5017600 = 3403^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 16598009 - 2⁸ = 16597753 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (16528009) 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, 11582 + ... + 12935.

It is an arithmetic number, because the mean of its divisors is an integer number (4155801).

Almost surely, 2^16598009 is an apocalyptic number.

It is an amenable number.

16598009 is a deficient number, since it is larger than the sum of its proper divisors (25195).

16598009 is an equidigital number, since it uses as much as digits as its factorization.

16598009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25194.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 16598009 is about 4074.0654143006. The cubic root of 16598009 is about 255.0852412705.

The spelling of 16598009 in words is "sixteen million, five hundred ninety-eight thousand, nine".