16988189 has 2 divisors, whose sum is σ = 16988190. Its totient is φ = 16988188.

The previous prime is 16988183. The next prime is 16988201. The reversal of 16988189 is 98188961.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 1582564 = 3925^2 + 1258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16988189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16988183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8494094 + 8494095.

It is an arithmetic number, because the mean of its divisors is an integer number (8494095).

Almost surely, 2^16988189 is an apocalyptic number.

It is an amenable number.

16988189 is a deficient number, since it is larger than the sum of its proper divisors (1).

16988189 is an equidigital number, since it uses as much as digits as its factorization.

16988189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 50.

The square root of 16988189 is about 4121.6730826207. The cubic root of 16988189 is about 257.0685974133.

The spelling of 16988189 in words is "sixteen million, nine hundred eighty-eight thousand, one hundred eighty-nine".