16454509 has 4 divisors (see below), whose sum is σ = 16837216. Its totient is φ = 16071804.

The previous prime is 16454497. The next prime is 16454561. The reversal of 16454509 is 90545461.

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 a cyclic number.

It is not a de Polignac number, because 16454509 - 2¹⁹ = 15930221 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 (16454609) 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, 191289 + ... + 191374.

It is an arithmetic number, because the mean of its divisors is an integer number (4209304).

Almost surely, 2^16454509 is an apocalyptic number.

It is an amenable number.

16454509 is a deficient number, since it is larger than the sum of its proper divisors (382707).

16454509 is an equidigital number, since it uses as much as digits as its factorization.

16454509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382706.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 16454509 is about 4056.4157824365. The cubic root of 16454509 is about 254.3479895538.

The spelling of 16454509 in words is "sixteen million, four hundred fifty-four thousand, five hundred nine".