16469509 has 4 divisors (see below), whose sum is σ = 18822304. Its totient is φ = 14116716.

The previous prime is 16469503. The next prime is 16469521. The reversal of 16469509 is 90596461.

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 an emirpimes, since its reverse is a distinct semiprime: 90596461 = 37 ⋅2448553.

It is a cyclic number.

It is not a de Polignac number, because 16469509 - 2³ = 16469501 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 (16469501) 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 3 ways as a sum of consecutive naturals, for example, 1176387 + ... + 1176400.

It is an arithmetic number, because the mean of its divisors is an integer number (4705576).

Almost surely, 2^16469509 is an apocalyptic number.

It is an amenable number.

16469509 is a deficient number, since it is larger than the sum of its proper divisors (2352795).

16469509 is an equidigital number, since it uses as much as digits as its factorization.

16469509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352794.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 16469509 is about 4058.2642841491. The cubic root of 16469509 is about 254.4252543146.

The spelling of 16469509 in words is "sixteen million, four hundred sixty-nine thousand, five hundred nine".