11111240981 has 2 divisors, whose sum is σ = 11111240982. Its totient is φ = 11111240980.

The previous prime is 11111240977. The next prime is 11111241041. The reversal of 11111240981 is 18904211111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5816350225 + 5294890756 = 76265^2 + 72766^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111240981 - 2² = 11111240977 is a prime.

It is a super-2 number, since 2×11111240981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111240971) 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 as a sum of consecutive naturals, namely, 5555620490 + 5555620491.

It is an arithmetic number, because the mean of its divisors is an integer number (5555620491).

Almost surely, 2^11111240981 is an apocalyptic number.

It is an amenable number.

11111240981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111240981 is an equidigital number, since it uses as much as digits as its factorization.

11111240981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 11111240981 in words is "eleven billion, one hundred eleven million, two hundred forty thousand, nine hundred eighty-one".