131278744721 has 8 divisors (see below), whose sum is σ = 131638663680. Its totient is φ = 130919299488.

The previous prime is 131278744693. The next prime is 131278744747. The reversal of 131278744721 is 127447872131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131278744721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131278744621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440165 + ... + 675501.

It is an arithmetic number, because the mean of its divisors is an integer number (16454832960).

Almost surely, 2^131278744721 is an apocalyptic number.

It is an amenable number.

131278744721 is a deficient number, since it is larger than the sum of its proper divisors (359918959).

131278744721 is an equidigital number, since it uses as much as digits as its factorization.

131278744721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236863.

The product of its digits is 526848, while the sum is 47.

The spelling of 131278744721 in words is "one hundred thirty-one billion, two hundred seventy-eight million, seven hundred forty-four thousand, seven hundred twenty-one".