131333331 has 4 divisors (see below), whose sum is σ = 175111112. Its totient is φ = 87555552.

The previous prime is 131333317. The next prime is 131333353. The reversal of 131333331 is 133333131.

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

It is not a de Polignac number, because 131333331 - 2⁷ = 131333203 is a prime.

It is a super-2 number, since 2×131333331² = 34496887663111122, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131333298 and 131333307.

It is not an unprimeable number, because it can be changed into a prime (131333131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21888886 + ... + 21888891.

It is an arithmetic number, because the mean of its divisors is an integer number (43777778).

Almost surely, 2^131333331 is an apocalyptic number.

131333331 is a deficient number, since it is larger than the sum of its proper divisors (43777781).

131333331 is an equidigital number, since it uses as much as digits as its factorization.

131333331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43777780.

The product of its digits is 729, while the sum is 21.

The square root of 131333331 is about 11460.0755233114. The cubic root of 131333331 is about 508.3057078122.

Adding to 131333331 its reverse (133333131), we get a palindrome (264666462).

The spelling of 131333331 in words is "one hundred thirty-one million, three hundred thirty-three thousand, three hundred thirty-one".