131323321 has 4 divisors (see below), whose sum is σ = 133549200. Its totient is φ = 129097444.

The previous prime is 131323303. The next prime is 131323349. The reversal of 131323321 is 123323131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123323131 = 3019 ⋅40849.

It is a cyclic number.

It is not a de Polignac number, because 131323321 - 2⁹ = 131322809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131323921) 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, 1112851 + ... + 1112968.

It is an arithmetic number, because the mean of its divisors is an integer number (33387300).

Almost surely, 2^131323321 is an apocalyptic number.

It is an amenable number.

131323321 is a deficient number, since it is larger than the sum of its proper divisors (2225879).

131323321 is an equidigital number, since it uses as much as digits as its factorization.

131323321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225878.

The product of its digits is 324, while the sum is 19.

The square root of 131323321 is about 11459.6387813927. The cubic root of 131323321 is about 508.2927934226.

Adding to 131323321 its reverse (123323131), we get a palindrome (254646452).

The spelling of 131323321 in words is "one hundred thirty-one million, three hundred twenty-three thousand, three hundred twenty-one".