12291908687 has 4 divisors (see below), whose sum is σ = 12292932600. Its totient is φ = 12290884776.

The previous prime is 12291908677. The next prime is 12291908711. The reversal of 12291908687 is 78680919221.

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 12291908687 - 2²⁰ = 12290860111 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 (12291908617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493733 + ... + 518030.

It is an arithmetic number, because the mean of its divisors is an integer number (3073233150).

Almost surely, 2^12291908687 is an apocalyptic number.

12291908687 is a deficient number, since it is larger than the sum of its proper divisors (1023913).

12291908687 is a wasteful number, since it uses less digits than its factorization.

12291908687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023912.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 12291908687 in words is "twelve billion, two hundred ninety-one million, nine hundred eight thousand, six hundred eighty-seven".