12291777871 has 4 divisors (see below), whose sum is σ = 12413478744. Its totient is φ = 12170077000.

The previous prime is 12291777859. The next prime is 12291777899. The reversal of 12291777871 is 17877719221.

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 12291777871 - 2²⁷ = 12157560143 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 (12291777811) 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, 60850285 + ... + 60850486.

It is an arithmetic number, because the mean of its divisors is an integer number (3103369686).

Almost surely, 2^12291777871 is an apocalyptic number.

12291777871 is a deficient number, since it is larger than the sum of its proper divisors (121700873).

12291777871 is a wasteful number, since it uses less digits than its factorization.

12291777871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121700872.

The product of its digits is 691488, while the sum is 52.

The spelling of 12291777871 in words is "twelve billion, two hundred ninety-one million, seven hundred seventy-seven thousand, eight hundred seventy-one".