131223331 has 4 divisors (see below), whose sum is σ = 131267200. Its totient is φ = 131179464.

The previous prime is 131223317. The next prime is 131223361. The reversal of 131223331 is 133322131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133322131 = 3217 ⋅41443.

It is a cyclic number.

It is not a de Polignac number, because 131223331 - 2⁵ = 131223299 is a prime.

It is a super-2 number, since 2×131223331² = 34439125197471122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223299 and 131223308.

It is not an unprimeable number, because it can be changed into a prime (131223361) 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, 17091 + ... + 23548.

It is an arithmetic number, because the mean of its divisors is an integer number (32816800).

Almost surely, 2^131223331 is an apocalyptic number.

131223331 is a deficient number, since it is larger than the sum of its proper divisors (43869).

131223331 is an equidigital number, since it uses as much as digits as its factorization.

131223331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43868.

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

The square root of 131223331 is about 11455.2752476752. The cubic root of 131223331 is about 508.1637554099.

Adding to 131223331 its reverse (133322131), we get a palindrome (264545462).

The spelling of 131223331 in words is "one hundred thirty-one million, two hundred twenty-three thousand, three hundred thirty-one".