131545 has 4 divisors (see below), whose sum is σ = 157860. Its totient is φ = 105232.

The previous prime is 131543. The next prime is 131561. The reversal of 131545 is 545131.

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 26569 + 104976 = 163^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 131545 - 2¹ = 131543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13150 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (39465).

2¹³¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

131545 is a deficient number, since it is larger than the sum of its proper divisors (26315).

131545 is an equidigital number, since it uses as much as digits as its factorization.

131545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26314.

The product of its digits is 300, while the sum is 19.

The square root of 131545 is about 362.6913288183. The cubic root of 131545 is about 50.8578638808.

Adding to 131545 its reverse (545131), we get a palindrome (676676).

It can be divided in two parts, 131 and 545, that added together give a palindrome (676).

The spelling of 131545 in words is "one hundred thirty-one thousand, five hundred forty-five".