19413809 has 2 divisors, whose sum is σ = 19413810. Its totient is φ = 19413808.

The previous prime is 19413767. The next prime is 19413827. The reversal of 19413809 is 90831491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 5276209 = 3760^2 + 2297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19413809 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19413829) 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 as a sum of consecutive naturals, namely, 9706904 + 9706905.

It is an arithmetic number, because the mean of its divisors is an integer number (9706905).

Almost surely, 2^19413809 is an apocalyptic number.

It is an amenable number.

19413809 is a deficient number, since it is larger than the sum of its proper divisors (1).

19413809 is an equidigital number, since it uses as much as digits as its factorization.

19413809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 19413809 is about 4406.1104162288. The cubic root of 19413809 is about 268.7634769517.

The spelling of 19413809 in words is "nineteen million, four hundred thirteen thousand, eight hundred nine".