131745 has 8 divisors (see below), whose sum is σ = 210816. Its totient is φ = 70256.

The previous prime is 131743. The next prime is 131749. The reversal of 131745 is 547131.

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

It is a cyclic number.

It is not a de Polignac number, because 131745 - 2¹ = 131743 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131743) 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 7 ways as a sum of consecutive naturals, for example, 4377 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (26352).

2¹³¹⁷⁴⁵ is an apocalyptic number.

131745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131745 is a deficient number, since it is larger than the sum of its proper divisors (79071).

131745 is an equidigital number, since it uses as much as digits as its factorization.

131745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8791.

The product of its digits is 420, while the sum is 21.

The square root of 131745 is about 362.9669406434. The cubic root of 131745 is about 50.8836254635.

Adding to 131745 its reverse (547131), we get a palindrome (678876).

The spelling of 131745 in words is "one hundred thirty-one thousand, seven hundred forty-five".