16553209 has 2 divisors, whose sum is σ = 16553210. Its totient is φ = 16553208.

The previous prime is 16553197. The next prime is 16553231. The reversal of 16553209 is 90235561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 7997584 = 2925^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 16553209 - 2⁷ = 16553081 is a prime.

It is not a weakly prime, because it can be changed into another prime (16553239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276604 + 8276605.

It is an arithmetic number, because the mean of its divisors is an integer number (8276605).

Almost surely, 2^16553209 is an apocalyptic number.

It is an amenable number.

16553209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16553209 is an equidigital number, since it uses as much as digits as its factorization.

16553209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 16553209 is about 4068.5635057106. The cubic root of 16553209 is about 254.8555326764.

The spelling of 16553209 in words is "sixteen million, five hundred fifty-three thousand, two hundred nine".