16491089 has 2 divisors, whose sum is σ = 16491090. Its totient is φ = 16491088.

The previous prime is 16491029. The next prime is 16491133. The reversal of 16491089 is 98019461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 555025 = 3992^2 + 745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16491089 is a prime.

It is not a weakly prime, because it can be changed into another prime (16491029) 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, 8245544 + 8245545.

It is an arithmetic number, because the mean of its divisors is an integer number (8245545).

Almost surely, 2^16491089 is an apocalyptic number.

It is an amenable number.

16491089 is a deficient number, since it is larger than the sum of its proper divisors (1).

16491089 is an equidigital number, since it uses as much as digits as its factorization.

16491089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 16491089 is about 4060.9221859080. The cubic root of 16491089 is about 254.5363302968.

The spelling of 16491089 in words is "sixteen million, four hundred ninety-one thousand, eighty-nine".