131287 has 4 divisors (see below), whose sum is σ = 141400. Its totient is φ = 121176.

The previous prime is 131267. The next prime is 131293. The reversal of 131287 is 782131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782131 = 7 ⋅111733.

It is a cyclic number.

It is not a de Polignac number, because 131287 - 2¹⁵ = 98519 is a prime.

It is a Duffinian number.

131287 is a modest number, since divided by 1287 gives 13 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131267) 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, 5037 + ... + 5062.

It is an arithmetic number, because the mean of its divisors is an integer number (35350).

2¹³¹²⁸⁷ is an apocalyptic number.

131287 is a deficient number, since it is larger than the sum of its proper divisors (10113).

131287 is a wasteful number, since it uses less digits than its factorization.

131287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112.

The product of its digits is 336, while the sum is 22.

The square root of 131287 is about 362.3354799078. The cubic root of 131287 is about 50.8245928416.

The spelling of 131287 in words is "one hundred thirty-one thousand, two hundred eighty-seven".