12118991081 has 2 divisors, whose sum is σ = 12118991082. Its totient is φ = 12118991080.

The previous prime is 12118991039. The next prime is 12118991113. The reversal of 12118991081 is 18019981121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8511907600 + 3607083481 = 92260^2 + 60059^2 .

It is a cyclic number.

It is not a de Polignac number, because 12118991081 - 2¹⁰ = 12118990057 is a prime.

It is a super-2 number, since 2×12118991081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12118997081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6059495540 + 6059495541.

It is an arithmetic number, because the mean of its divisors is an integer number (6059495541).

Almost surely, 2^12118991081 is an apocalyptic number.

It is an amenable number.

12118991081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12118991081 is an equidigital number, since it uses as much as digits as its factorization.

12118991081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 12118991081 in words is "twelve billion, one hundred eighteen million, nine hundred ninety-one thousand, eighty-one".