16900509 has 4 divisors (see below), whose sum is σ = 22534016. Its totient is φ = 11267004.

The previous prime is 16900493. The next prime is 16900511. The reversal of 16900509 is 90500961.

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 16900509 - 2⁴ = 16900493 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 (16900109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2816749 + ... + 2816754.

It is an arithmetic number, because the mean of its divisors is an integer number (5633504).

Almost surely, 2^16900509 is an apocalyptic number.

It is an amenable number.

16900509 is a deficient number, since it is larger than the sum of its proper divisors (5633507).

16900509 is an equidigital number, since it uses as much as digits as its factorization.

16900509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633506.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 16900509 is about 4111.0228654193. The cubic root of 16900509 is about 256.6255707146.

The spelling of 16900509 in words is "sixteen million, nine hundred thousand, five hundred nine".