11810681291 has 4 divisors (see below), whose sum is σ = 11862710952. Its totient is φ = 11758651632.

The previous prime is 11810681273. The next prime is 11810681299. The reversal of 11810681291 is 19218601811.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11810681291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11810681299) 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, 26014490 + ... + 26014943.

It is an arithmetic number, because the mean of its divisors is an integer number (2965677738).

Almost surely, 2^11810681291 is an apocalyptic number.

11810681291 is a deficient number, since it is larger than the sum of its proper divisors (52029661).

11810681291 is an equidigital number, since it uses as much as digits as its factorization.

11810681291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52029660.

The product of its (nonzero) digits is 6912, while the sum is 38.

The spelling of 11810681291 in words is "eleven billion, eight hundred ten million, six hundred eighty-one thousand, two hundred ninety-one".