12387291909 has 4 divisors (see below), whose sum is σ = 16516389216. Its totient is φ = 8258194604.

The previous prime is 12387291887. The next prime is 12387291949. The reversal of 12387291909 is 90919278321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90919278321 = 3 ⋅30306426107.

It is a cyclic number.

It is not a de Polignac number, because 12387291909 - 2⁷ = 12387291781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12387291949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064548649 + ... + 2064548654.

It is an arithmetic number, because the mean of its divisors is an integer number (4129097304).

Almost surely, 2^12387291909 is an apocalyptic number.

It is an amenable number.

12387291909 is a deficient number, since it is larger than the sum of its proper divisors (4129097307).

12387291909 is an equidigital number, since it uses as much as digits as its factorization.

12387291909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4129097306.

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 12387291909 in words is "twelve billion, three hundred eighty-seven million, two hundred ninety-one thousand, nine hundred nine".