16919609 has 4 divisors (see below), whose sum is σ = 19336704. Its totient is φ = 14502516.

The previous prime is 16919587. The next prime is 16919611. The reversal of 16919609 is 90691961.

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 16919609 - 2¹² = 16915513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16919629) 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, 1208537 + ... + 1208550.

It is an arithmetic number, because the mean of its divisors is an integer number (4834176).

Almost surely, 2^16919609 is an apocalyptic number.

It is an amenable number.

16919609 is a deficient number, since it is larger than the sum of its proper divisors (2417095).

16919609 is an equidigital number, since it uses as much as digits as its factorization.

16919609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417094.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 16919609 is about 4113.3452322897. The cubic root of 16919609 is about 256.7222088903.

The spelling of 16919609 in words is "sixteen million, nine hundred nineteen thousand, six hundred nine".