12020509 has 2 divisors, whose sum is σ = 12020510. Its totient is φ = 12020508.

The previous prime is 12020507. The next prime is 12020527. The reversal of 12020509 is 90502021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8139609 + 3880900 = 2853^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020509 - 2¹ = 12020507 is a prime.

Together with 12020507, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010254 + 6010255.

It is an arithmetic number, because the mean of its divisors is an integer number (6010255).

Almost surely, 2^12020509 is an apocalyptic number.

It is an amenable number.

12020509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020509 is an equidigital number, since it uses as much as digits as its factorization.

12020509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 12020509 is about 3467.0605705698. The cubic root of 12020509 is about 229.0732017462.

The spelling of 12020509 in words is "twelve million, twenty thousand, five hundred nine".