19968611 has 4 divisors (see below), whose sum is σ = 21504672. Its totient is φ = 18432552.

The previous prime is 19968589. The next prime is 19968629. The reversal of 19968611 is 11686991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11686991 = 3323 ⋅3517.

It is a cyclic number.

It is not a de Polignac number, because 19968611 - 2²² = 15774307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19968631) 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 in 3 ways as a sum of consecutive naturals, for example, 768011 + ... + 768036.

It is an arithmetic number, because the mean of its divisors is an integer number (5376168).

Almost surely, 2^19968611 is an apocalyptic number.

19968611 is a deficient number, since it is larger than the sum of its proper divisors (1536061).

19968611 is a wasteful number, since it uses less digits than its factorization.

19968611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536060.

The product of its digits is 23328, while the sum is 41.

The square root of 19968611 is about 4468.6251800750. The cubic root of 19968611 is about 271.2996825472.

The spelling of 19968611 in words is "nineteen million, nine hundred sixty-eight thousand, six hundred eleven".