16519909 has 8 divisors (see below), whose sum is σ = 19265600. Its totient is φ = 14159628.

The previous prime is 16519907. The next prime is 16519961. The reversal of 16519909 is 90991561.

It is not a de Polignac number, because 16519909 - 2¹ = 16519907 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 (16519901) 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, 23739 + ... + 24424.

It is an arithmetic number, because the mean of its divisors is an integer number (2408200).

Almost surely, 2^16519909 is an apocalyptic number.

It is an amenable number.

16519909 is a deficient number, since it is larger than the sum of its proper divisors (2745691).

16519909 is an frugal number, since it uses more digits than its factorization.

16519909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48184 (or 48170 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 16519909 is about 4064.4690920217. The cubic root of 16519909 is about 254.6845207902.

The spelling of 16519909 in words is "sixteen million, five hundred nineteen thousand, nine hundred nine".