131306278721 has 8 divisors (see below), whose sum is σ = 133792551144. Its totient is φ = 128820332160.

The previous prime is 131306278703. The next prime is 131306278751. The reversal of 131306278721 is 127872603131.

It can be written as a sum of positive squares in 4 ways, for example, as 60289891600 + 71016387121 = 245540^2 + 266489^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131306278721 - 2¹⁸ = 131306016577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131306278751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827045 + ... + 972941.

It is an arithmetic number, because the mean of its divisors is an integer number (16724068893).

Almost surely, 2^131306278721 is an apocalyptic number.

It is an amenable number.

131306278721 is a deficient number, since it is larger than the sum of its proper divisors (2486272423).

131306278721 is a wasteful number, since it uses less digits than its factorization.

131306278721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162931.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 131306278721 in words is "one hundred thirty-one billion, three hundred six million, two hundred seventy-eight thousand, seven hundred twenty-one".