19799609 has 2 divisors, whose sum is σ = 19799610. Its totient is φ = 19799608.

The previous prime is 19799599. The next prime is 19799617. The reversal of 19799609 is 90699791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14417209 + 5382400 = 3797^2 + 2320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19799609 is a prime.

It is not a weakly prime, because it can be changed into another prime (19799629) 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, 9899804 + 9899805.

It is an arithmetic number, because the mean of its divisors is an integer number (9899805).

Almost surely, 2^19799609 is an apocalyptic number.

It is an amenable number.

19799609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19799609 is an equidigital number, since it uses as much as digits as its factorization.

19799609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 19799609 is about 4449.6751566828. The cubic root of 19799609 is about 270.5321421005.

The spelling of 19799609 in words is "nineteen million, seven hundred ninety-nine thousand, six hundred nine".