16266989 has 2 divisors, whose sum is σ = 16266990. Its totient is φ = 16266988.

The previous prime is 16266967. The next prime is 16267007. The reversal of 16266989 is 98966261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 5442889 = 3290^2 + 2333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16266989 is a prime.

It is a super-2 number, since 2×16266989² = 529229862252242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16262989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8133494 + 8133495.

It is an arithmetic number, because the mean of its divisors is an integer number (8133495).

Almost surely, 2^16266989 is an apocalyptic number.

It is an amenable number.

16266989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16266989 is an equidigital number, since it uses as much as digits as its factorization.

16266989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 16266989 is about 4033.2355497789. The cubic root of 16266989 is about 253.3780897763.

The spelling of 16266989 in words is "sixteen million, two hundred sixty-six thousand, nine hundred eighty-nine".