131099 has 4 divisors (see below), whose sum is σ = 135360. Its totient is φ = 126840.

The previous prime is 131071. The next prime is 131101. The reversal of 131099 is 990131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990131 = 17 ⋅58243.

It is a cyclic number.

It is not a de Polignac number, because 131099 - 2⁸ = 130843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084 + ... + 2145.

It is an arithmetic number, because the mean of its divisors is an integer number (33840).

2¹³¹⁰⁹⁹ is an apocalyptic number.

131099 is a deficient number, since it is larger than the sum of its proper divisors (4261).

131099 is an equidigital number, since it uses as much as digits as its factorization.

131099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 131099 is about 362.0759588816. The cubic root of 131099 is about 50.8003213653.

The spelling of 131099 in words is "one hundred thirty-one thousand, ninety-nine".