1100111231281 has 2 divisors, whose sum is σ = 1100111231282. Its totient is φ = 1100111231280.

The previous prime is 1100111231279. The next prime is 1100111231377. The reversal of 1100111231281 is 1821321110011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100012904225 + 98327056 = 1048815^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100111231281 - 2¹ = 1100111231279 is a prime.

It is a super-2 number, since 2×1100111231281² (a number of 25 digits) contains 22 as substring.

Together with 1100111231279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1100111231081) 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 as a sum of consecutive naturals, namely, 550055615640 + 550055615641.

It is an arithmetic number, because the mean of its divisors is an integer number (550055615641).

Almost surely, 2^{1100111231281} is an apocalyptic number.

It is an amenable number.

1100111231281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100111231281 is an equidigital number, since it uses as much as digits as its factorization.

1100111231281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 22.

Adding to 1100111231281 its reverse (1821321110011), we get a palindrome (2921432341292).

The spelling of 1100111231281 in words is "one trillion, one hundred billion, one hundred eleven million, two hundred thirty-one thousand, two hundred eighty-one".