16519989 has 8 divisors (see below), whose sum is σ = 22355680. Its totient is φ = 10848816.

The previous prime is 16519967. The next prime is 16519991. The reversal of 16519989 is 98991561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16519989 - 2¹² = 16515893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16519999) 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 7 ways as a sum of consecutive naturals, for example, 40894 + ... + 41295.

It is an arithmetic number, because the mean of its divisors is an integer number (2794460).

Almost surely, 2^16519989 is an apocalyptic number.

It is an amenable number.

16519989 is a deficient number, since it is larger than the sum of its proper divisors (5835691).

16519989 is an equidigital number, since it uses as much as digits as its factorization.

16519989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82259.

The product of its digits is 174960, while the sum is 48.

The square root of 16519989 is about 4064.4789333936. The cubic root of 16519989 is about 254.6849319048.

The spelling of 16519989 in words is "sixteen million, five hundred nineteen thousand, nine hundred eighty-nine".