16889491 has 2 divisors, whose sum is σ = 16889492. Its totient is φ = 16889490.

The previous prime is 16889459. The next prime is 16889503. The reversal of 16889491 is 19498861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16889491 - 2⁵ = 16889459 is a prime.

It is not a weakly prime, because it can be changed into another prime (16880491) 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, 8444745 + 8444746.

It is an arithmetic number, because the mean of its divisors is an integer number (8444746).

Almost surely, 2^16889491 is an apocalyptic number.

16889491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16889491 is an equidigital number, since it uses as much as digits as its factorization.

16889491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 16889491 is about 4109.6825911498. The cubic root of 16889491 is about 256.5697910295.

The spelling of 16889491 in words is "sixteen million, eight hundred eighty-nine thousand, four hundred ninety-one".