16985225 has 6 divisors (see below), whose sum is σ = 21061710. Its totient is φ = 13588160.

The previous prime is 16985209. The next prime is 16985233. The reversal of 16985225 is 52258961.

It can be written as a sum of positive squares in 3 ways, for example, as 109561 + 16875664 = 331^2 + 4108^2 .

It is not a de Polignac number, because 16985225 - 2⁴ = 16985209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339680 + ... + 339729.

It is an arithmetic number, because the mean of its divisors is an integer number (3510285).

Almost surely, 2^16985225 is an apocalyptic number.

It is an amenable number.

16985225 is a deficient number, since it is larger than the sum of its proper divisors (4076485).

16985225 is an equidigital number, since it uses as much as digits as its factorization.

16985225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679419 (or 679414 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 16985225 is about 4121.3135042120. The cubic root of 16985225 is about 257.0536459346.

The spelling of 16985225 in words is "sixteen million, nine hundred eighty-five thousand, two hundred twenty-five".