16553409 has 8 divisors (see below), whose sum is σ = 22584672. Its totient is φ = 10778880.

The previous prime is 16553363. The next prime is 16553413. The reversal of 16553409 is 90435561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16553409 - 2⁷ = 16553281 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16553409.

It is not an unprimeable number, because it can be changed into a prime (16553479) 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 7 ways as a sum of consecutive naturals, for example, 64032 + ... + 64289.

It is an arithmetic number, because the mean of its divisors is an integer number (2823084).

Almost surely, 2^16553409 is an apocalyptic number.

It is an amenable number.

16553409 is a deficient number, since it is larger than the sum of its proper divisors (6031263).

16553409 is a wasteful number, since it uses less digits than its factorization.

16553409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128367.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 16553409 is about 4068.5880843359. The cubic root of 16553409 is about 254.8565590816.

The spelling of 16553409 in words is "sixteen million, five hundred fifty-three thousand, four hundred nine".