19766969 has 2 divisors, whose sum is σ = 19766970. Its totient is φ = 19766968.

The previous prime is 19766911. The next prime is 19766993. The reversal of 19766969 is 96966791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10156969 + 9610000 = 3187^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 19766969 - 2¹⁶ = 19701433 is a prime.

It is a super-3 number, since 3×19766969³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19766969.

It is not a weakly prime, because it can be changed into another prime (19766909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9883484 + 9883485.

It is an arithmetic number, because the mean of its divisors is an integer number (9883485).

Almost surely, 2^19766969 is an apocalyptic number.

It is an amenable number.

19766969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19766969 is an equidigital number, since it uses as much as digits as its factorization.

19766969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 53.

The square root of 19766969 is about 4446.0059604099. The cubic root of 19766969 is about 270.3834013553.

Subtracting from 19766969 its sum of digits (53), we obtain a square (19766916 = 4446²).

The spelling of 19766969 in words is "nineteen million, seven hundred sixty-six thousand, nine hundred sixty-nine".