131245321 has 4 divisors (see below), whose sum is σ = 138965652. Its totient is φ = 123524992.

The previous prime is 131245277. The next prime is 131245393. The reversal of 131245321 is 123542131.

It is a happy number.

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 75951225 + 55294096 = 8715^2 + 7436^2 .

It is not a de Polignac number, because 131245321 - 2⁷ = 131245193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131245292 and 131245301.

It is not an unprimeable number, because it can be changed into a prime (131245921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3860140 + ... + 3860173.

It is an arithmetic number, because the mean of its divisors is an integer number (34741413).

Almost surely, 2^131245321 is an apocalyptic number.

It is an amenable number.

131245321 is a deficient number, since it is larger than the sum of its proper divisors (7720331).

131245321 is an equidigital number, since it uses as much as digits as its factorization.

131245321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720330.

The product of its digits is 720, while the sum is 22.

The square root of 131245321 is about 11456.2350272679. The cubic root of 131245321 is about 508.1921393280.

Adding to 131245321 its reverse (123542131), we get a palindrome (254787452).

The spelling of 131245321 in words is "one hundred thirty-one million, two hundred forty-five thousand, three hundred twenty-one".