19969669 has 2 divisors, whose sum is σ = 19969670. Its totient is φ = 19969668.

The previous prime is 19969667. The next prime is 19969687. The reversal of 19969669 is 96696991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 3849444 = 4015^2 + 1962^2 .

It is a cyclic number.

It is not a de Polignac number, because 19969669 - 2¹ = 19969667 is a prime.

It is a super-2 number, since 2×19969669² = 797575359939122, which contains 22 as substring.

Together with 19969667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19969667) 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, 9984834 + 9984835.

It is an arithmetic number, because the mean of its divisors is an integer number (9984835).

Almost surely, 2^19969669 is an apocalyptic number.

It is an amenable number.

19969669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19969669 is an equidigital number, since it uses as much as digits as its factorization.

19969669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 55.

The square root of 19969669 is about 4468.7435594359. The cubic root of 19969669 is about 271.3044739003.

The spelling of 19969669 in words is "nineteen million, nine hundred sixty-nine thousand, six hundred sixty-nine".