16628189 has 2 divisors, whose sum is σ = 16628190. Its totient is φ = 16628188.

The previous prime is 16628111. The next prime is 16628203. The reversal of 16628189 is 98182661.

16628189 is nontrivially palindromic in base 12.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 1844164 = 3845^2 + 1358^2 .

It is a cyclic number.

It is not a de Polignac number, because 16628189 - 2¹² = 16624093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16628089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8314094 + 8314095.

It is an arithmetic number, because the mean of its divisors is an integer number (8314095).

Almost surely, 2^16628189 is an apocalyptic number.

It is an amenable number.

16628189 is a deficient number, since it is larger than the sum of its proper divisors (1).

16628189 is an equidigital number, since it uses as much as digits as its factorization.

16628189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 16628189 is about 4077.7676490943. The cubic root of 16628189 is about 255.2397540049.

The spelling of 16628189 in words is "sixteen million, six hundred twenty-eight thousand, one hundred eighty-nine".