131105229281 has 4 divisors (see below), whose sum is σ = 141190246932. Its totient is φ = 121020211632.

The previous prime is 131105229271. The next prime is 131105229293. The reversal of 131105229281 is 182922501131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77818123681 + 53287105600 = 278959^2 + 230840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131105229281 is a prime.

It is a super-2 number, since 2×131105229281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131105229271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5042508806 + ... + 5042508831.

It is an arithmetic number, because the mean of its divisors is an integer number (35297561733).

Almost surely, 2^131105229281 is an apocalyptic number.

It is an amenable number.

131105229281 is a deficient number, since it is larger than the sum of its proper divisors (10085017651).

131105229281 is a wasteful number, since it uses less digits than its factorization.

131105229281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10085017650.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 131105229281 in words is "one hundred thirty-one billion, one hundred five million, two hundred twenty-nine thousand, two hundred eighty-one".