19986061 has 2 divisors, whose sum is σ = 19986062. Its totient is φ = 19986060.

The previous prime is 19986053. The next prime is 19986077. The reversal of 19986061 is 16068991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 4541161 = 3930^2 + 2131^2 .

It is an emirp because it is prime and its reverse (16068991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19986061 - 2³ = 19986053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19986091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993030 + 9993031.

It is an arithmetic number, because the mean of its divisors is an integer number (9993031).

Almost surely, 2^19986061 is an apocalyptic number.

It is an amenable number.

19986061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19986061 is an equidigital number, since it uses as much as digits as its factorization.

19986061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19986061 is about 4470.5772557915. The cubic root of 19986061 is about 271.3786865586.

The spelling of 19986061 in words is "nineteen million, nine hundred eighty-six thousand, sixty-one".