231240023 has 4 divisors (see below), whose sum is σ = 264274320. Its totient is φ = 198205728.

The previous prime is 231240019. The next prime is 231240029. The reversal of 231240023 is 320042132.

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

It is not a de Polignac number, because 231240023 - 2² = 231240019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231239983 and 231240010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231240029) 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, 16517138 + ... + 16517151.

It is an arithmetic number, because the mean of its divisors is an integer number (66068580).

Almost surely, 2^231240023 is an apocalyptic number.

231240023 is a deficient number, since it is larger than the sum of its proper divisors (33034297).

231240023 is an equidigital number, since it uses as much as digits as its factorization.

231240023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33034296.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 231240023 is about 15206.5782804680. The cubic root of 231240023 is about 613.7916857436.

Adding to 231240023 its reverse (320042132), we get a palindrome (551282155).

The spelling of 231240023 in words is "two hundred thirty-one million, two hundred forty thousand, twenty-three".