16553903 has 4 divisors (see below), whose sum is σ = 17527680. Its totient is φ = 15580128.

The previous prime is 16553893. The next prime is 16553941. The reversal of 16553903 is 30935561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16553903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16553903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486863 + ... + 486896.

It is an arithmetic number, because the mean of its divisors is an integer number (4381920).

Almost surely, 2^16553903 is an apocalyptic number.

16553903 is a deficient number, since it is larger than the sum of its proper divisors (973777).

16553903 is an equidigital number, since it uses as much as digits as its factorization.

16553903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973776.

The product of its (nonzero) digits is 12150, while the sum is 32.

The square root of 16553903 is about 4068.6487929041. The cubic root of 16553903 is about 254.8590942671.

The spelling of 16553903 in words is "sixteen million, five hundred fifty-three thousand, nine hundred three".