19936661 has 2 divisors, whose sum is σ = 19936662. Its totient is φ = 19936660.

The previous prime is 19936633. The next prime is 19936711. The reversal of 19936661 is 16663991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 1874161 = 4250^2 + 1369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19936661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19936061) 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, 9968330 + 9968331.

It is an arithmetic number, because the mean of its divisors is an integer number (9968331).

Almost surely, 2^19936661 is an apocalyptic number.

It is an amenable number.

19936661 is a deficient number, since it is larger than the sum of its proper divisors (1).

19936661 is an equidigital number, since it uses as much as digits as its factorization.

19936661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 41.

The square root of 19936661 is about 4465.0488239212. The cubic root of 19936661 is about 271.1549111366.

The spelling of 19936661 in words is "nineteen million, nine hundred thirty-six thousand, six hundred sixty-one".