16228081 has 8 divisors (see below), whose sum is σ = 17775720. Its totient is φ = 14746368.

The previous prime is 16228073. The next prime is 16228099. The reversal of 16228081 is 18082261.

It can be written as a sum of positive squares in 4 ways, for example, as 4769856 + 11458225 = 2184^2 + 3385^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16228081 - 2³ = 16228073 is a prime.

It is a super-2 number, since 2×16228081² = 526701225885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16228001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15966 + ... + 16951.

It is an arithmetic number, because the mean of its divisors is an integer number (2221965).

Almost surely, 2^16228081 is an apocalyptic number.

It is an amenable number.

16228081 is a deficient number, since it is larger than the sum of its proper divisors (1547639).

16228081 is a wasteful number, since it uses less digits than its factorization.

16228081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32963.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16228081 is about 4028.4092393897. The cubic root of 16228081 is about 253.1759153992.

The spelling of 16228081 in words is "sixteen million, two hundred twenty-eight thousand, eighty-one".