131091 has 8 divisors (see below), whose sum is σ = 179664. Its totient is φ = 84960.

The previous prime is 131071. The next prime is 131101. The reversal of 131091 is 190131.

131091 = T₆₅ + T₆₆ + ... + T₁₀₁.

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

It is not a de Polignac number, because 131091 - 2⁵ = 131059 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 131091.

It is not an unprimeable number, because it can be changed into a prime (131011) 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, 480 + ... + 701.

It is an arithmetic number, because the mean of its divisors is an integer number (22458).

2¹³¹⁰⁹¹ is an apocalyptic number.

131091 is a deficient number, since it is larger than the sum of its proper divisors (48573).

131091 is a wasteful number, since it uses less digits than its factorization.

131091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 27, while the sum is 15.

The square root of 131091 is about 362.0649113074. The cubic root of 131091 is about 50.7992880219.

The spelling of 131091 in words is "one hundred thirty-one thousand, ninety-one".