12019309 has 2 divisors, whose sum is σ = 12019310. Its totient is φ = 12019308.

The previous prime is 12019279. The next prime is 12019327. The reversal of 12019309 is 90391021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11923209 + 96100 = 3453^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 12019309 - 2⁵ = 12019277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12019349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6009654 + 6009655.

It is an arithmetic number, because the mean of its divisors is an integer number (6009655).

Almost surely, 2^12019309 is an apocalyptic number.

It is an amenable number.

12019309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12019309 is an equidigital number, since it uses as much as digits as its factorization.

12019309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 12019309 is about 3466.8875089913. The cubic root of 12019309 is about 229.0655787471.

The spelling of 12019309 in words is "twelve million, nineteen thousand, three hundred nine".