120181011991 has 2 divisors, whose sum is σ = 120181011992. Its totient is φ = 120181011990.

The previous prime is 120181011971. The next prime is 120181011997. The reversal of 120181011991 is 199110181021.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (199110181021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120181011991 - 2⁵ = 120181011959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120181011997) 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, 60090505995 + 60090505996.

It is an arithmetic number, because the mean of its divisors is an integer number (60090505996).

Almost surely, 2^120181011991 is an apocalyptic number.

120181011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120181011991 is an equidigital number, since it uses as much as digits as its factorization.

120181011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 34.

The spelling of 120181011991 in words is "one hundred twenty billion, one hundred eighty-one million, eleven thousand, nine hundred ninety-one".