131240321 has 4 divisors (see below), whose sum is σ = 132593412. Its totient is φ = 129887232.

The previous prime is 131240299. The next prime is 131240371. The reversal of 131240321 is 123042131.

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 27709696 + 103530625 = 5264^2 + 10175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131240321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131240321.

It is not an unprimeable number, because it can be changed into a prime (131240371) 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, 676400 + ... + 676593.

It is an arithmetic number, because the mean of its divisors is an integer number (33148353).

Almost surely, 2^131240321 is an apocalyptic number.

It is an amenable number.

131240321 is a deficient number, since it is larger than the sum of its proper divisors (1353091).

131240321 is an equidigital number, since it uses as much as digits as its factorization.

131240321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353090.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 131240321 is about 11456.0168034095. The cubic root of 131240321 is about 508.1856857824.

Adding to 131240321 its reverse (123042131), we get a palindrome (254282452).

The spelling of 131240321 in words is "one hundred thirty-one million, two hundred forty thousand, three hundred twenty-one".