16989499 has 4 divisors (see below), whose sum is σ = 17055864. Its totient is φ = 16923136.

The previous prime is 16989491. The next prime is 16989523. The reversal of 16989499 is 99498961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16989499 - 2³ = 16989491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16989491) 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, 32797 + ... + 33310.

It is an arithmetic number, because the mean of its divisors is an integer number (4263966).

Almost surely, 2^16989499 is an apocalyptic number.

16989499 is a deficient number, since it is larger than the sum of its proper divisors (66365).

16989499 is an equidigital number, since it uses as much as digits as its factorization.

16989499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66364.

The product of its digits is 1259712, while the sum is 55.

The square root of 16989499 is about 4121.8319956058. The cubic root of 16989499 is about 257.0752049688.

The spelling of 16989499 in words is "sixteen million, nine hundred eighty-nine thousand, four hundred ninety-nine".