131491 has 4 divisors (see below), whose sum is σ = 137232. Its totient is φ = 125752.

The previous prime is 131489. The next prime is 131497. The reversal of 131491 is 194131.

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: 194131 = 7 ⋅27733.

It is a cyclic number.

It is not a de Polignac number, because 131491 - 2¹ = 131489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (34308).

2¹³¹⁴⁹¹ is an apocalyptic number.

131491 is a deficient number, since it is larger than the sum of its proper divisors (5741).

131491 is an equidigital number, since it uses as much as digits as its factorization.

131491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740.

The product of its digits is 108, while the sum is 19.

The square root of 131491 is about 362.6168777098. The cubic root of 131491 is about 50.8509037771.

The spelling of 131491 in words is "one hundred thirty-one thousand, four hundred ninety-one".