1111211108981 has 2 divisors, whose sum is σ = 1111211108982. Its totient is φ = 1111211108980.

The previous prime is 1111211108939. The next prime is 1111211108983. The reversal of 1111211108981 is 1898011121111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768061184881 + 343149924100 = 876391^2 + 585790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111211108981 - 2²⁶ = 1111144000117 is a prime.

It is a super-2 number, since 2×1111211108981² (a number of 25 digits) contains 22 as substring.

Together with 1111211108983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111211108983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605554490 + 555605554491.

It is an arithmetic number, because the mean of its divisors is an integer number (555605554491).

Almost surely, 2^{1111211108981} is an apocalyptic number.

It is an amenable number.

1111211108981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111211108981 is an equidigital number, since it uses as much as digits as its factorization.

1111211108981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 35.

The spelling of 1111211108981 in words is "one trillion, one hundred eleven billion, two hundred eleven million, one hundred eight thousand, nine hundred eighty-one".