19964969 has 2 divisors, whose sum is σ = 19964970. Its totient is φ = 19964968.

The previous prime is 19964947. The next prime is 19964981. The reversal of 19964969 is 96946991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 8323225 = 3412^2 + 2885^2 .

It is an emirp because it is prime and its reverse (96946991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19964969 - 2²⁴ = 3187753 is a prime.

It is a super-2 number, since 2×19964969² = 797199974341922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19964969.

It is not a weakly prime, because it can be changed into another prime (19964999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982484 + 9982485.

It is an arithmetic number, because the mean of its divisors is an integer number (9982485).

Almost surely, 2^19964969 is an apocalyptic number.

It is an amenable number.

19964969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964969 is an equidigital number, since it uses as much as digits as its factorization.

19964969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 53.

The square root of 19964969 is about 4468.2176536064. The cubic root of 19964969 is about 271.2831877675.

The spelling of 19964969 in words is "nineteen million, nine hundred sixty-four thousand, nine hundred sixty-nine".