12118491481 has 2 divisors, whose sum is σ = 12118491482. Its totient is φ = 12118491480.

The previous prime is 12118491467. The next prime is 12118491491. The reversal of 12118491481 is 18419481121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8370603081 + 3747888400 = 91491^2 + 61220^2 .

It is an emirp because it is prime and its reverse (18419481121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12118491481 - 2⁷ = 12118491353 is a prime.

It is a super-2 number, since 2×12118491481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12118491491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6059245740 + 6059245741.

It is an arithmetic number, because the mean of its divisors is an integer number (6059245741).

Almost surely, 2^12118491481 is an apocalyptic number.

It is an amenable number.

12118491481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12118491481 is an equidigital number, since it uses as much as digits as its factorization.

12118491481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 40.

The spelling of 12118491481 in words is "twelve billion, one hundred eighteen million, four hundred ninety-one thousand, four hundred eighty-one".