11110109981 has 2 divisors, whose sum is σ = 11110109982. Its totient is φ = 11110109980.

The previous prime is 11110109971. The next prime is 11110110019. The reversal of 11110109981 is 18990101111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9459313081 + 1650796900 = 97259^2 + 40630^2 .

It is a cyclic number.

It is not a de Polignac number, because 11110109981 - 2¹⁴ = 11110093597 is a prime.

It is a super-2 number, since 2×11110109981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11110109971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555054990 + 5555054991.

It is an arithmetic number, because the mean of its divisors is an integer number (5555054991).

Almost surely, 2^11110109981 is an apocalyptic number.

It is an amenable number.

11110109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11110109981 is an equidigital number, since it uses as much as digits as its factorization.

11110109981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 32.

The spelling of 11110109981 in words is "eleven billion, one hundred ten million, one hundred nine thousand, nine hundred eighty-one".