131201321131981 has 2 divisors, whose sum is σ = 131201321131982. Its totient is φ = 131201321131980.

The previous prime is 131201321131967. The next prime is 131201321132017. The reversal of 131201321131981 is 189131123102131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123504214430025 + 7697106701956 = 11113245^2 + 2774366^2 .

It is a cyclic number.

It is not a de Polignac number, because 131201321131981 - 2⁹ = 131201321131469 is a prime.

It is a super-2 number, since 2×131201321131981² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131201321131981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131201321131481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65600660565990 + 65600660565991.

It is an arithmetic number, because the mean of its divisors is an integer number (65600660565991).

Almost surely, 2^{131201321131981} is an apocalyptic number.

It is an amenable number.

131201321131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131201321131981 is an equidigital number, since it uses as much as digits as its factorization.

131201321131981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 131201321131981 in words is "one hundred thirty-one trillion, two hundred one billion, three hundred twenty-one million, one hundred thirty-one thousand, nine hundred eighty-one".