131331 has 4 divisors (see below), whose sum is σ = 175112. Its totient is φ = 87552.

The previous prime is 131321. The next prime is 131357. The reversal of 131331 is 133131.

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

It is not a de Polignac number, because 131331 - 2⁶ = 131267 is a prime.

It is a super-2 number, since 2×131331² = 34495663122, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131311) 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, 21886 + ... + 21891.

It is an arithmetic number, because the mean of its divisors is an integer number (43778).

2¹³¹³³¹ is an apocalyptic number.

131331 is a deficient number, since it is larger than the sum of its proper divisors (43781).

131331 is an equidigital number, since it uses as much as digits as its factorization.

131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43780.

The product of its digits is 27, while the sum is 12.

The square root of 131331 is about 362.3961920330. The cubic root of 131331 is about 50.8302700534.

Adding to 131331 its reverse (133131), we get a palindrome (264462).

The spelling of 131331 in words is "one hundred thirty-one thousand, three hundred thirty-one".