12291808687 has 4 divisors (see below), whose sum is σ = 12306744880. Its totient is φ = 12276872496.

The previous prime is 12291808663. The next prime is 12291808691. The reversal of 12291808687 is 78680819221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12291808687 - 2¹⁵ = 12291775919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291808657) 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, 7466862 + ... + 7468507.

It is an arithmetic number, because the mean of its divisors is an integer number (3076686220).

Almost surely, 2^12291808687 is an apocalyptic number.

12291808687 is a deficient number, since it is larger than the sum of its proper divisors (14936193).

12291808687 is an equidigital number, since it uses as much as digits as its factorization.

12291808687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14936192.

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 12291808687 in words is "twelve billion, two hundred ninety-one million, eight hundred eight thousand, six hundred eighty-seven".