1122011111981 has 2 divisors, whose sum is σ = 1122011111982. Its totient is φ = 1122011111980.

The previous prime is 1122011111927. The next prime is 1122011112023. The reversal of 1122011111981 is 1891111102211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 908798049481 + 213213062500 = 953309^2 + 461750^2 .

It is an emirp because it is prime and its reverse (1891111102211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1122011111981 - 2⁶ = 1122011111917 is a prime.

It is a super-2 number, since 2×1122011111981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122011131981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561005555990 + 561005555991.

It is an arithmetic number, because the mean of its divisors is an integer number (561005555991).

Almost surely, 2^{1122011111981} is an apocalyptic number.

It is an amenable number.

1122011111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122011111981 is an equidigital number, since it uses as much as digits as its factorization.

1122011111981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 29.

The spelling of 1122011111981 in words is "one trillion, one hundred twenty-two billion, eleven million, one hundred eleven thousand, nine hundred eighty-one".