231440123 has 4 divisors (see below), whose sum is σ = 232826160. Its totient is φ = 230054088.

The previous prime is 231440117. The next prime is 231440129. The reversal of 231440123 is 321044132.

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

It is an interprime number because it is at equal distance from previous prime (231440117) and next prime (231440129).

It is a cyclic number.

It is not a de Polignac number, because 231440123 - 2⁴ = 231440107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231440095 and 231440104.

It is not an unprimeable number, because it can be changed into a prime (231440129) 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, 692768 + ... + 693101.

It is an arithmetic number, because the mean of its divisors is an integer number (58206540).

Almost surely, 2^231440123 is an apocalyptic number.

231440123 is a deficient number, since it is larger than the sum of its proper divisors (1386037).

231440123 is a wasteful number, since it uses less digits than its factorization.

231440123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386036.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231440123 is about 15213.1562471435. The cubic root of 231440123 is about 613.9686797677.

Adding to 231440123 its reverse (321044132), we get a palindrome (552484255).

The spelling of 231440123 in words is "two hundred thirty-one million, four hundred forty thousand, one hundred twenty-three".