131305 has 4 divisors (see below), whose sum is σ = 157572. Its totient is φ = 105040.

The previous prime is 131303. The next prime is 131311. The reversal of 131305 is 503131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16384 + 114921 = 128^2 + 339^2 .

It is not a de Polignac number, because 131305 - 2¹ = 131303 is a prime.

It is a Duffinian number.

131305 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131303) 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, 13126 + ... + 13135.

It is an arithmetic number, because the mean of its divisors is an integer number (39393).

2¹³¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

131305 is a deficient number, since it is larger than the sum of its proper divisors (26267).

131305 is an equidigital number, since it uses as much as digits as its factorization.

131305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26266.

The product of its (nonzero) digits is 45, while the sum is 13.

The square root of 131305 is about 362.3603179157. The cubic root of 131305 is about 50.8269154906.

Adding to 131305 its reverse (503131), we get a palindrome (634436).

The spelling of 131305 in words is "one hundred thirty-one thousand, three hundred five".