11681789281 has 4 divisors (see below), whose sum is σ = 11727243972. Its totient is φ = 11636334592.

The previous prime is 11681789279. The next prime is 11681789321. The reversal of 11681789281 is 18298718611.

11681789281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18298718611 = 3631 ⋅5039581.

It can be written as a sum of positive squares in 2 ways, for example, as 8296295056 + 3385494225 = 91084^2 + 58185^2 .

It is a cyclic number.

It is not a de Polignac number, because 11681789281 - 2¹ = 11681789279 is a prime.

It is a super-2 number, since 2×11681789281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11681789681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22726960 + ... + 22727473.

It is an arithmetic number, because the mean of its divisors is an integer number (2931810993).

Almost surely, 2^11681789281 is an apocalyptic number.

It is an amenable number.

11681789281 is a deficient number, since it is larger than the sum of its proper divisors (45454691).

11681789281 is an equidigital number, since it uses as much as digits as its factorization.

11681789281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45454690.

The product of its digits is 387072, while the sum is 52.

The spelling of 11681789281 in words is "eleven billion, six hundred eighty-one million, seven hundred eighty-nine thousand, two hundred eighty-one".