16189969 has 2 divisors, whose sum is σ = 16189970. Its totient is φ = 16189968.

The previous prime is 16189961. The next prime is 16189981. The reversal of 16189969 is 96998161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 508369 = 3960^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 16189969 - 2³ = 16189961 is a prime.

It is a super-2 number, since 2×16189969² = 524230192441922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16189961) 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, 8094984 + 8094985.

It is an arithmetic number, because the mean of its divisors is an integer number (8094985).

Almost surely, 2^16189969 is an apocalyptic number.

It is an amenable number.

16189969 is a deficient number, since it is larger than the sum of its proper divisors (1).

16189969 is an equidigital number, since it uses as much as digits as its factorization.

16189969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 49.

The square root of 16189969 is about 4023.6760555492. The cubic root of 16189969 is about 252.9775636652.

The spelling of 16189969 in words is "sixteen million, one hundred eighty-nine thousand, nine hundred sixty-nine".