16304681 has 4 divisors (see below), whose sum is σ = 16339200. Its totient is φ = 16270164.

The previous prime is 16304663. The next prime is 16304689. The reversal of 16304681 is 18640361.

16304681 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18640361 = 283 ⋅65867.

It is a cyclic number.

It is not a de Polignac number, because 16304681 - 2¹⁰ = 16303657 is a prime.

It is a super-2 number, since 2×16304681² = 531685245023522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16304689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16541 + ... + 17498.

It is an arithmetic number, because the mean of its divisors is an integer number (4084800).

Almost surely, 2^16304681 is an apocalyptic number.

It is an amenable number.

16304681 is a deficient number, since it is larger than the sum of its proper divisors (34519).

16304681 is an equidigital number, since it uses as much as digits as its factorization.

16304681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34518.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16304681 is about 4037.9055214306. The cubic root of 16304681 is about 253.5736383631.

The spelling of 16304681 in words is "sixteen million, three hundred four thousand, six hundred eighty-one".