11011100981 has 2 divisors, whose sum is σ = 11011100982. Its totient is φ = 11011100980.

The previous prime is 11011100977. The next prime is 11011101011. The reversal of 11011100981 is 18900111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10392783025 + 618317956 = 101945^2 + 24866^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011100981 - 2² = 11011100977 is a prime.

It is a super-2 number, since 2×11011100981² (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 (11011100941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505550490 + 5505550491.

It is an arithmetic number, because the mean of its divisors is an integer number (5505550491).

Almost surely, 2^11011100981 is an apocalyptic number.

It is an amenable number.

11011100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011100981 is an equidigital number, since it uses as much as digits as its factorization.

11011100981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 23.

Adding to 11011100981 its reverse (18900111011), we get a palindrome (29911211992).

The spelling of 11011100981 in words is "eleven billion, eleven million, one hundred thousand, nine hundred eighty-one".