16909213 has 4 divisors (see below), whose sum is σ = 16920640. Its totient is φ = 16897788.

The previous prime is 16909187. The next prime is 16909219. The reversal of 16909213 is 31290961.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31290961 = 13 ⋅2406997.

It is a cyclic number.

It is not a de Polignac number, because 16909213 - 2⁵ = 16909181 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 (16909219) 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, 3093 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (4230160).

Almost surely, 2^16909213 is an apocalyptic number.

It is an amenable number.

16909213 is a deficient number, since it is larger than the sum of its proper divisors (11427).

16909213 is an equidigital number, since it uses as much as digits as its factorization.

16909213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11426.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 16909213 is about 4112.0813464716. The cubic root of 16909213 is about 256.6696184140.

The spelling of 16909213 in words is "sixteen million, nine hundred nine thousand, two hundred thirteen".