16559081 has 16 divisors (see below), whose sum is σ = 20901888. Its totient is φ = 12742800.

The previous prime is 16559063. The next prime is 16559083. The reversal of 16559081 is 18095561.

It is not a de Polignac number, because 16559081 - 2¹⁸ = 16296937 is a prime.

It is a super-2 number, since 2×16559081² = 548406327129122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16559083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5096 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (1306368).

Almost surely, 2^16559081 is an apocalyptic number.

16559081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16559081 is a deficient number, since it is larger than the sum of its proper divisors (4342807).

16559081 is a wasteful number, since it uses less digits than its factorization.

16559081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 16559081 is about 4069.2850723438. The cubic root of 16559081 is about 254.8856644929.

The spelling of 16559081 in words is "sixteen million, five hundred fifty-nine thousand, eighty-one".