19699969 has 2 divisors, whose sum is σ = 19699970. Its totient is φ = 19699968.

The previous prime is 19699951. The next prime is 19699987. The reversal of 19699969 is 96999691.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (19699951) and next prime (19699987).

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 2930944 = 4095^2 + 1712^2 .

It is an emirp because it is prime and its reverse (96999691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19699969 - 2⁹ = 19699457 is a prime.

It is a super-2 number, since 2×19699969² = 776177557201922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19696969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849984 + 9849985.

It is an arithmetic number, because the mean of its divisors is an integer number (9849985).

Almost surely, 2^19699969 is an apocalyptic number.

It is an amenable number.

19699969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19699969 is an equidigital number, since it uses as much as digits as its factorization.

19699969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2125764, while the sum is 58.

The square root of 19699969 is about 4438.4647120373. The cubic root of 19699969 is about 270.0775680198.

The spelling of 19699969 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred sixty-nine".