11812117281 has 16 divisors (see below), whose sum is σ = 16732920000. Its totient is φ = 7397707968.

The previous prime is 11812117249. The next prime is 11812117297. The reversal of 11812117281 is 18271121811.

It is not a de Polignac number, because 11812117281 - 2⁵ = 11812117249 is a prime.

It is a super-2 number, since 2×11812117281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11812117231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1831531 + ... + 1837968.

It is an arithmetic number, because the mean of its divisors is an integer number (1045807500).

Almost surely, 2^11812117281 is an apocalyptic number.

It is an amenable number.

11812117281 is a deficient number, since it is larger than the sum of its proper divisors (4920802719).

11812117281 is a wasteful number, since it uses less digits than its factorization.

11812117281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669568.

The product of its digits is 1792, while the sum is 33.

The spelling of 11812117281 in words is "eleven billion, eight hundred twelve million, one hundred seventeen thousand, two hundred eighty-one".