131031223 has 4 divisors (see below), whose sum is σ = 138738960. Its totient is φ = 123323488.

The previous prime is 131031209. The next prime is 131031227. The reversal of 131031223 is 322130131.

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 131031223 - 2¹⁷ = 130900151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131031197 and 131031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3853843 + ... + 3853876.

It is an arithmetic number, because the mean of its divisors is an integer number (34684740).

Almost surely, 2^131031223 is an apocalyptic number.

131031223 is a deficient number, since it is larger than the sum of its proper divisors (7707737).

131031223 is an equidigital number, since it uses as much as digits as its factorization.

131031223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707736.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131031223 is about 11446.8870440832. The cubic root of 131031223 is about 507.9156542028.

Adding to 131031223 its reverse (322130131), we get a palindrome (453161354).

The spelling of 131031223 in words is "one hundred thirty-one million, thirty-one thousand, two hundred twenty-three".