16189081 has 2 divisors, whose sum is σ = 16189082. Its totient is φ = 16189080.

The previous prime is 16189051. The next prime is 16189093. The reversal of 16189081 is 18098161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 467856 = 3965^2 + 684^2 .

It is an emirp because it is prime and its reverse (18098161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16189081 - 2¹¹ = 16187033 is a prime.

It is a super-2 number, since 2×16189081² = 524172687249122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16189001) 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, 8094540 + 8094541.

It is an arithmetic number, because the mean of its divisors is an integer number (8094541).

Almost surely, 2^16189081 is an apocalyptic number.

It is an amenable number.

16189081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16189081 is an equidigital number, since it uses as much as digits as its factorization.

16189081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 16189081 is about 4023.5657071806. The cubic root of 16189081 is about 252.9729384106.

The spelling of 16189081 in words is "sixteen million, one hundred eighty-nine thousand, eighty-one".