131320221 has 4 divisors (see below), whose sum is σ = 175093632. Its totient is φ = 87546812.

The previous prime is 131320219. The next prime is 131320261. The reversal of 131320221 is 122023131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131320221 - 2¹ = 131320219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131320261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21886701 + ... + 21886706.

It is an arithmetic number, because the mean of its divisors is an integer number (43773408).

Almost surely, 2^131320221 is an apocalyptic number.

It is an amenable number.

131320221 is a deficient number, since it is larger than the sum of its proper divisors (43773411).

131320221 is an equidigital number, since it uses as much as digits as its factorization.

131320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43773410.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 131320221 is about 11459.5035232771. The cubic root of 131320221 is about 508.2887938282.

Adding to 131320221 its reverse (122023131), we get a palindrome (253343352).

The spelling of 131320221 in words is "one hundred thirty-one million, three hundred twenty thousand, two hundred twenty-one".