12261001009 has 2 divisors, whose sum is σ = 12261001010. Its totient is φ = 12261001008.

The previous prime is 12261001007. The next prime is 12261001021. The reversal of 12261001009 is 90010016221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11689934400 + 571066609 = 108120^2 + 23897^2 .

It is an emirp because it is prime and its reverse (90010016221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12261001009 - 2¹ = 12261001007 is a prime.

Together with 12261001007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12261001003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6130500504 + 6130500505.

It is an arithmetic number, because the mean of its divisors is an integer number (6130500505).

Almost surely, 2^12261001009 is an apocalyptic number.

It is an amenable number.

12261001009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12261001009 is an equidigital number, since it uses as much as digits as its factorization.

12261001009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 12261001009 in words is "twelve billion, two hundred sixty-one million, one thousand, nine".