131332321 has 4 divisors (see below), whose sum is σ = 133182144. Its totient is φ = 129482500.

The previous prime is 131332319. The next prime is 131332339. The reversal of 131332321 is 123233131.

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: 123233131 = 7 ⋅17604733.

It is a cyclic number.

It is not a de Polignac number, because 131332321 - 2¹ = 131332319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131332391) 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, 924805 + ... + 924946.

It is an arithmetic number, because the mean of its divisors is an integer number (33295536).

Almost surely, 2^131332321 is an apocalyptic number.

It is an amenable number.

131332321 is a deficient number, since it is larger than the sum of its proper divisors (1849823).

131332321 is an equidigital number, since it uses as much as digits as its factorization.

131332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849822.

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

The square root of 131332321 is about 11460.0314571994. The cubic root of 131332321 is about 508.3044047917.

Adding to 131332321 its reverse (123233131), we get a palindrome (254565452).

The spelling of 131332321 in words is "one hundred thirty-one million, three hundred thirty-two thousand, three hundred twenty-one".