19136209 has 2 divisors, whose sum is σ = 19136210. Its totient is φ = 19136208.

The previous prime is 19136197. The next prime is 19136213. The reversal of 19136209 is 90263191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 1830609 = 4160^2 + 1353^2 .

It is an emirp because it is prime and its reverse (90263191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19136209 is a prime.

It is not a weakly prime, because it can be changed into another prime (19136279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9568104 + 9568105.

It is an arithmetic number, because the mean of its divisors is an integer number (9568105).

Almost surely, 2^19136209 is an apocalyptic number.

It is an amenable number.

19136209 is a deficient number, since it is larger than the sum of its proper divisors (1).

19136209 is an equidigital number, since it uses as much as digits as its factorization.

19136209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 19136209 is about 4374.4952851729. The cubic root of 19136209 is about 267.4762968487.

The spelling of 19136209 in words is "nineteen million, one hundred thirty-six thousand, two hundred nine".