131323231 has 8 divisors (see below), whose sum is σ = 148868720. Its totient is φ = 114841152.

The previous prime is 131323189. The next prime is 131323253. The reversal of 131323231 is 132323131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131323231 - 2⁷ = 131323103 is a prime.

It is a super-2 number, since 2×131323231² = 34491582000558722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 131323199 and 131323208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321231) 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 7 ways as a sum of consecutive naturals, for example, 265590 + ... + 266083.

It is an arithmetic number, because the mean of its divisors is an integer number (18608590).

Almost surely, 2^131323231 is an apocalyptic number.

131323231 is a deficient number, since it is larger than the sum of its proper divisors (17545489).

131323231 is a wasteful number, since it uses less digits than its factorization.

131323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531705.

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

The square root of 131323231 is about 11459.6348545667. The cubic root of 131323231 is about 508.2926773063.

Adding to 131323231 its reverse (132323131), we get a palindrome (263646362).

The spelling of 131323231 in words is "one hundred thirty-one million, three hundred twenty-three thousand, two hundred thirty-one".