11331131231281 has 2 divisors, whose sum is σ = 11331131231282. Its totient is φ = 11331131231280.

The previous prime is 11331131231279. The next prime is 11331131231311. The reversal of 11331131231281 is 18213213113311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11233162231281 + 97969000000 = 3351591^2 + 313000^2 .

It is an emirp because it is prime and its reverse (18213213113311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11331131231281 - 2¹ = 11331131231279 is a prime.

It is a super-2 number, since 2×11331131231281² (a number of 27 digits) contains 22 as substring.

Together with 11331131231279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11331131231081) 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 as a sum of consecutive naturals, namely, 5665565615640 + 5665565615641.

It is an arithmetic number, because the mean of its divisors is an integer number (5665565615641).

Almost surely, 2^{11331131231281} is an apocalyptic number.

It is an amenable number.

11331131231281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11331131231281 is an equidigital number, since it uses as much as digits as its factorization.

11331131231281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

Adding to 11331131231281 its reverse (18213213113311), we get a palindrome (29544344344592).

The spelling of 11331131231281 in words is "eleven trillion, three hundred thirty-one billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred eighty-one".