231305123 has 4 divisors (see below), whose sum is σ = 264348720. Its totient is φ = 198261528.

The previous prime is 231305119. The next prime is 231305141. The reversal of 231305123 is 321503132.

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 231305123 - 2² = 231305119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231305095 and 231305104.

It is not an unprimeable number, because it can be changed into a prime (231305153) 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, 16521788 + ... + 16521801.

It is an arithmetic number, because the mean of its divisors is an integer number (66087180).

Almost surely, 2^231305123 is an apocalyptic number.

231305123 is a deficient number, since it is larger than the sum of its proper divisors (33043597).

231305123 is an equidigital number, since it uses as much as digits as its factorization.

231305123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33043596.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 231305123 is about 15208.7186508266. The cubic root of 231305123 is about 613.8492797089.

Adding to 231305123 its reverse (321503132), we get a palindrome (552808255).

The spelling of 231305123 in words is "two hundred thirty-one million, three hundred five thousand, one hundred twenty-three".