324120181981 has 2 divisors, whose sum is σ = 324120181982. Its totient is φ = 324120181980.

The previous prime is 324120181961. The next prime is 324120181991. The reversal of 324120181981 is 189181021423.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260601061081 + 63519120900 = 510491^2 + 252030^2 .

It is a cyclic number.

It is not a de Polignac number, because 324120181981 - 2¹⁷ = 324120050909 is a prime.

It is a super-2 number, since 2×324120181981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (324120181951) 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, 162060090990 + 162060090991.

It is an arithmetic number, because the mean of its divisors is an integer number (162060090991).

Almost surely, 2^324120181981 is an apocalyptic number.

It is an amenable number.

324120181981 is a deficient number, since it is larger than the sum of its proper divisors (1).

324120181981 is an equidigital number, since it uses as much as digits as its factorization.

324120181981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 324120181981 in words is "three hundred twenty-four billion, one hundred twenty million, one hundred eighty-one thousand, nine hundred eighty-one".