131291 has 4 divisors (see below), whose sum is σ = 139032. Its totient is φ = 123552.

The previous prime is 131267. The next prime is 131293. The reversal of 131291 is 192131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192131 = 229 ⋅839.

It is a cyclic number.

It is not a de Polignac number, because 131291 - 2¹⁰ = 130267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 7723 = 131291 / (1 + 3 + 1 + 2 + 9 + 1).

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (131293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3845 + ... + 3878.

It is an arithmetic number, because the mean of its divisors is an integer number (34758).

2¹³¹²⁹¹ is an apocalyptic number.

131291 is a deficient number, since it is larger than the sum of its proper divisors (7741).

131291 is an equidigital number, since it uses as much as digits as its factorization.

131291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740.

The product of its digits is 54, while the sum is 17.

The square root of 131291 is about 362.3409996122. The cubic root of 131291 is about 50.8251090042.

The spelling of 131291 in words is "one hundred thirty-one thousand, two hundred ninety-one".