19992169 has 2 divisors, whose sum is σ = 19992170. Its totient is φ = 19992168.

The previous prime is 19992157. The next prime is 19992191. The reversal of 19992169 is 96129991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 3952144 = 4005^2 + 1988^2 .

It is an emirp because it is prime and its reverse (96129991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19992169 - 2¹⁹ = 19467881 is a prime.

It is a super-2 number, since 2×19992169² = 799373642649122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19992569) 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, 9996084 + 9996085.

It is an arithmetic number, because the mean of its divisors is an integer number (9996085).

Almost surely, 2^19992169 is an apocalyptic number.

It is an amenable number.

19992169 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992169 is an equidigital number, since it uses as much as digits as its factorization.

19992169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 46.

The square root of 19992169 is about 4471.2603368625. The cubic root of 19992169 is about 271.4063293607.

The spelling of 19992169 in words is "nineteen million, nine hundred ninety-two thousand, one hundred sixty-nine".