243231304123 has 4 divisors (see below), whose sum is σ = 245006715240. Its totient is φ = 241455893008.

The previous prime is 243231304109. The next prime is 243231304181. The reversal of 243231304123 is 321403132342.

It is a happy number.

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-243231304123 is a prime.

It is a super-2 number, since 2×243231304123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243231304091 and 243231304100.

It is not an unprimeable number, because it can be changed into a prime (243231304423) 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, 887705353 + ... + 887705626.

It is an arithmetic number, because the mean of its divisors is an integer number (61251678810).

Almost surely, 2^243231304123 is an apocalyptic number.

243231304123 is a deficient number, since it is larger than the sum of its proper divisors (1775411117).

243231304123 is a wasteful number, since it uses less digits than its factorization.

243231304123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775411116.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 243231304123 its reverse (321403132342), we get a palindrome (564634436465).

The spelling of 243231304123 in words is "two hundred forty-three billion, two hundred thirty-one million, three hundred four thousand, one hundred twenty-three".