16321985 has 4 divisors (see below), whose sum is σ = 19586388. Its totient is φ = 13057584.

The previous prime is 16321961. The next prime is 16321999. The reversal of 16321985 is 58912361.

16321985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 10086976 = 2497^2 + 3176^2 .

It is a cyclic number.

It is not a de Polignac number, because 16321985 - 2⁸ = 16321729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1632194 + ... + 1632203.

It is an arithmetic number, because the mean of its divisors is an integer number (4896597).

Almost surely, 2^16321985 is an apocalyptic number.

It is an amenable number.

16321985 is a deficient number, since it is larger than the sum of its proper divisors (3264403).

16321985 is an equidigital number, since it uses as much as digits as its factorization.

16321985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264402.

The product of its digits is 12960, while the sum is 35.

The square root of 16321985 is about 4040.0476482339. The cubic root of 16321985 is about 253.6633117295.

The spelling of 16321985 in words is "sixteen million, three hundred twenty-one thousand, nine hundred eighty-five".