16005181 has 2 divisors, whose sum is σ = 16005182. Its totient is φ = 16005180.

The previous prime is 16005173. The next prime is 16005191. The reversal of 16005181 is 18150061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 4137156 = 3445^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 16005181 - 2³ = 16005173 is a prime.

It is a super-2 number, since 2×16005181² = 512331637685522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16005131) 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 as a sum of consecutive naturals, namely, 8002590 + 8002591.

It is an arithmetic number, because the mean of its divisors is an integer number (8002591).

Almost surely, 2^16005181 is an apocalyptic number.

It is an amenable number.

16005181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16005181 is an equidigital number, since it uses as much as digits as its factorization.

16005181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 16005181 is about 4000.6475725812. The cubic root of 16005181 is about 252.0114055894.

The spelling of 16005181 in words is "sixteen million, five thousand, one hundred eighty-one".