231231423 has 4 divisors (see below), whose sum is σ = 308308568. Its totient is φ = 154154280.

The previous prime is 231231409. The next prime is 231231439. The reversal of 231231423 is 324132132.

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

It is not a de Polignac number, because 231231423 - 2⁵ = 231231391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231231423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231323) 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, 38538568 + ... + 38538573.

It is an arithmetic number, because the mean of its divisors is an integer number (77077142).

Almost surely, 2^231231423 is an apocalyptic number.

231231423 is a deficient number, since it is larger than the sum of its proper divisors (77077145).

231231423 is an equidigital number, since it uses as much as digits as its factorization.

231231423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77077144.

The product of its digits is 864, while the sum is 21.

The square root of 231231423 is about 15206.2955054806. The cubic root of 231231423 is about 613.7840765159.

Adding to 231231423 its reverse (324132132), we get a palindrome (555363555).

The spelling of 231231423 in words is "two hundred thirty-one million, two hundred thirty-one thousand, four hundred twenty-three".