11121130981 has 2 divisors, whose sum is σ = 11121130982. Its totient is φ = 11121130980.

The previous prime is 11121130961. The next prime is 11121131011. The reversal of 11121130981 is 18903112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10684529956 + 436601025 = 103366^2 + 20895^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121130981 - 2⁵ = 11121130949 is a prime.

It is a super-2 number, since 2×11121130981² (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 (11121130961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560565490 + 5560565491.

It is an arithmetic number, because the mean of its divisors is an integer number (5560565491).

Almost surely, 2^11121130981 is an apocalyptic number.

It is an amenable number.

11121130981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121130981 is an equidigital number, since it uses as much as digits as its factorization.

11121130981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 28.

It can be divided in two parts, 11121130 and 981, that added together give a palindrome (11122111).

The spelling of 11121130981 in words is "eleven billion, one hundred twenty-one million, one hundred thirty thousand, nine hundred eighty-one".