131245 has 4 divisors (see below), whose sum is σ = 157500. Its totient is φ = 104992.

The previous prime is 131231. The next prime is 131249. The reversal of 131245 is 542131.

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 75076 + 56169 = 274^2 + 237^2 .

It is a cyclic number.

It is not a de Polignac number, because 131245 - 2⁵ = 131213 is a prime.

131245 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131249) 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, 13120 + ... + 13129.

It is an arithmetic number, because the mean of its divisors is an integer number (39375).

2¹³¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

131245 is a deficient number, since it is larger than the sum of its proper divisors (26255).

131245 is an equidigital number, since it uses as much as digits as its factorization.

131245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26254.

The product of its digits is 120, while the sum is 16.

The square root of 131245 is about 362.2775179334. The cubic root of 131245 is about 50.8191725015.

Adding to 131245 its reverse (542131), we get a palindrome (673376).

The spelling of 131245 in words is "one hundred thirty-one thousand, two hundred forty-five".