231431323 has 4 divisors (see below), whose sum is σ = 232094800. Its totient is φ = 230767848.

The previous prime is 231431311. The next prime is 231431329. The reversal of 231431323 is 323134132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231431323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231431294 and 231431303.

It is not an unprimeable number, because it can be changed into a prime (231431329) 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, 331215 + ... + 331912.

It is an arithmetic number, because the mean of its divisors is an integer number (58023700).

Almost surely, 2^231431323 is an apocalyptic number.

231431323 is a deficient number, since it is larger than the sum of its proper divisors (663477).

231431323 is an equidigital number, since it uses as much as digits as its factorization.

231431323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663476.

The product of its digits is 1296, while the sum is 22.

The square root of 231431323 is about 15212.8670210450. The cubic root of 231431323 is about 613.9608980676.

Adding to 231431323 its reverse (323134132), we get a palindrome (554565455).

The spelling of 231431323 in words is "two hundred thirty-one million, four hundred thirty-one thousand, three hundred twenty-three".