19934609 has 2 divisors, whose sum is σ = 19934610. Its totient is φ = 19934608.

The previous prime is 19934573. The next prime is 19934633. The reversal of 19934609 is 90643991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 7997584 = 3455^2 + 2828^2 .

It is an emirp because it is prime and its reverse (90643991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19934609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19934689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9967304 + 9967305.

It is an arithmetic number, because the mean of its divisors is an integer number (9967305).

Almost surely, 2^19934609 is an apocalyptic number.

It is an amenable number.

19934609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19934609 is an equidigital number, since it uses as much as digits as its factorization.

19934609 is an evil number, because the sum of its binary digits is even.

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

The square root of 19934609 is about 4464.8190332868. The cubic root of 19934609 is about 271.1456078574.

The spelling of 19934609 in words is "nineteen million, nine hundred thirty-four thousand, six hundred nine".