131320321 has 16 divisors (see below), whose sum is σ = 145358208. Its totient is φ = 117648000.

The previous prime is 131320297. The next prime is 131320327. The reversal of 131320321 is 123023131.

It is a cyclic number.

It is not a de Polignac number, because 131320321 - 2¹¹ = 131318273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131320295 and 131320304.

It is not an unprimeable number, because it can be changed into a prime (131320327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287125 + ... + 287581.

It is an arithmetic number, because the mean of its divisors is an integer number (9084888).

Almost surely, 2^131320321 is an apocalyptic number.

131320321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131320321 is a deficient number, since it is larger than the sum of its proper divisors (14037887).

131320321 is a wasteful number, since it uses less digits than its factorization.

131320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131320321 is about 11459.5078864670. The cubic root of 131320321 is about 508.2889228484.

Adding to 131320321 its reverse (123023131), we get a palindrome (254343452).

The spelling of 131320321 in words is "one hundred thirty-one million, three hundred twenty thousand, three hundred twenty-one".