131320331 has 4 divisors (see below), whose sum is σ = 132008064. Its totient is φ = 130632600.

The previous prime is 131320327. The next prime is 131320337. The reversal of 131320331 is 133023131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131320331 - 2² = 131320327 is a prime.

It is a super-2 number, since 2×131320331² = 34490058667899122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131320337) 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, 343580 + ... + 343961.

It is an arithmetic number, because the mean of its divisors is an integer number (33002016).

Almost surely, 2^131320331 is an apocalyptic number.

131320331 is a deficient number, since it is larger than the sum of its proper divisors (687733).

131320331 is an equidigital number, since it uses as much as digits as its factorization.

131320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687732.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 131320331 is about 11459.5083227859. The cubic root of 131320331 is about 508.2889357504.

Adding to 131320331 its reverse (133023131), we get a palindrome (264343462).

The spelling of 131320331 in words is "one hundred thirty-one million, three hundred twenty thousand, three hundred thirty-one".