18889081 has 2 divisors, whose sum is σ = 18889082. Its totient is φ = 18889080.

The previous prime is 18889051. The next prime is 18889099. The reversal of 18889081 is 18098881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12538681 + 6350400 = 3541^2 + 2520^2 .

It is a cyclic number.

It is not a de Polignac number, because 18889081 - 2¹⁷ = 18758009 is a prime.

It is a super-2 number, since 2×18889081² = 713594762049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18889051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444540 + 9444541.

It is an arithmetic number, because the mean of its divisors is an integer number (9444541).

Almost surely, 2^18889081 is an apocalyptic number.

It is an amenable number.

18889081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889081 is an equidigital number, since it uses as much as digits as its factorization.

18889081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 18889081 is about 4346.1570381200. The cubic root of 18889081 is about 266.3198942190.

The spelling of 18889081 in words is "eighteen million, eight hundred eighty-nine thousand, eighty-one".