243123353442 has 40 divisors (see below), whose sum is σ = 545023377756. Its totient is φ = 81004377888.

The previous prime is 243123353353. The next prime is 243123353471. The reversal of 243123353442 is 244353321342.

243123353442 is a `hidden beast` number, since 2 + 4 + 312 + 335 + 3 + 4 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 156823128081 + 86300225361 = 396009^2 + 293769^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243123353397 and 243123353406.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19428 + ... + 697584.

Almost surely, 2^243123353442 is an apocalyptic number.

243123353442 is an abundant number, since it is smaller than the sum of its proper divisors (301900024314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243123353442 is a wasteful number, since it uses less digits than its factorization.

243123353442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680384 (or 680375 counting only the distinct ones).

The product of its digits is 207360, while the sum is 36.

Adding to 243123353442 its reverse (244353321342), we get a palindrome (487476674784).

The spelling of 243123353442 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred fifty-three thousand, four hundred forty-two".