131161 has 4 divisors (see below), whose sum is σ = 135424. Its totient is φ = 126900.

The previous prime is 131149. The next prime is 131171. The reversal of 131161 is 161131.

It is a happy number.

131161 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161131 = 269 ⋅599.

It is a cyclic number.

It is not a de Polignac number, because 131161 - 2⁵ = 131129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131101) 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, 2085 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (33856).

2¹³¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

131161 is a deficient number, since it is larger than the sum of its proper divisors (4263).

131161 is an equidigital number, since it uses as much as digits as its factorization.

131161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262.

The product of its digits is 18, while the sum is 13.

The square root of 131161 is about 362.1615661552. The cubic root of 131161 is about 50.8083283512.

Adding to 131161 its reverse (161131), we get a palindrome (292292).

It can be divided in two parts, 131 and 161, that added together give a palindrome (292).

The spelling of 131161 in words is "one hundred thirty-one thousand, one hundred sixty-one".