19730609 has 2 divisors, whose sum is σ = 19730610. Its totient is φ = 19730608.

The previous prime is 19730597. The next prime is 19730671. The reversal of 19730609 is 90603791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 616225 = 4372^2 + 785^2 .

It is an emirp because it is prime and its reverse (90603791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19730609 - 2²⁰ = 18682033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19730699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9865304 + 9865305.

It is an arithmetic number, because the mean of its divisors is an integer number (9865305).

Almost surely, 2^19730609 is an apocalyptic number.

It is an amenable number.

19730609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19730609 is an equidigital number, since it uses as much as digits as its factorization.

19730609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 19730609 is about 4441.9150149457. The cubic root of 19730609 is about 270.2175156202.

The spelling of 19730609 in words is "nineteen million, seven hundred thirty thousand, six hundred nine".