131321441981 has 2 divisors, whose sum is σ = 131321441982. Its totient is φ = 131321441980.

The previous prime is 131321441971. The next prime is 131321442037. The reversal of 131321441981 is 189144123131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129834105625 + 1487336356 = 360325^2 + 38566^2 .

It is a cyclic number.

It is not a de Polignac number, because 131321441981 - 2¹⁸ = 131321179837 is a prime.

It is a super-2 number, since 2×131321441981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131321441921) 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, 65660720990 + 65660720991.

It is an arithmetic number, because the mean of its divisors is an integer number (65660720991).

Almost surely, 2^131321441981 is an apocalyptic number.

It is an amenable number.

131321441981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131321441981 is an equidigital number, since it uses as much as digits as its factorization.

131321441981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The spelling of 131321441981 in words is "one hundred thirty-one billion, three hundred twenty-one million, four hundred forty-one thousand, nine hundred eighty-one".