131323221 has 8 divisors (see below), whose sum is σ = 194552960. Its totient is φ = 87548796.

The previous prime is 131323189. The next prime is 131323253. The reversal of 131323221 is 122323131.

It is an interprime number because it is at equal distance from previous prime (131323189) and next prime (131323253).

It is not a de Polignac number, because 131323221 - 2⁵ = 131323189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131323194 and 131323203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131323921) 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 7 ways as a sum of consecutive naturals, for example, 2431885 + ... + 2431938.

It is an arithmetic number, because the mean of its divisors is an integer number (24319120).

Almost surely, 2^131323221 is an apocalyptic number.

It is an amenable number.

131323221 is a deficient number, since it is larger than the sum of its proper divisors (63229739).

131323221 is an equidigital number, since it uses as much as digits as its factorization.

131323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4863832 (or 4863826 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 131323221 is about 11459.6344182526. The cubic root of 131323221 is about 508.2926644044.

Adding to 131323221 its reverse (122323131), we get a palindrome (253646352).

The spelling of 131323221 in words is "one hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty-one".