16004561 has 8 divisors (see below), whose sum is σ = 16261248. Its totient is φ = 15750000.

The previous prime is 16004551. The next prime is 16004567. The reversal of 16004561 is 16540061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16004561 is a prime.

It is a super-2 number, since 2×16004561² = 512291945605442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16004567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20936 + ... + 21686.

It is an arithmetic number, because the mean of its divisors is an integer number (2032656).

Almost surely, 2^16004561 is an apocalyptic number.

It is an amenable number.

16004561 is a deficient number, since it is larger than the sum of its proper divisors (256687).

16004561 is a wasteful number, since it uses less digits than its factorization.

16004561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16004561 is about 4000.5700843755. The cubic root of 16004561 is about 252.0081514538.

The spelling of 16004561 in words is "sixteen million, four thousand, five hundred sixty-one".