243123345 has 12 divisors (see below), whose sum is σ = 421413876. Its totient is φ = 129665760.

The previous prime is 243123343. The next prime is 243123389. The reversal of 243123345 is 543321342.

243123345 is a `hidden beast` number, since 2 + 4 + 312 + 3 + 345 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53758224 + 189365121 = 7332^2 + 13761^2 .

It is not a de Polignac number, because 243123345 - 2¹ = 243123343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243123343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2701326 + ... + 2701415.

It is an arithmetic number, because the mean of its divisors is an integer number (35117823).

Almost surely, 2^243123345 is an apocalyptic number.

It is an amenable number.

243123345 is a deficient number, since it is larger than the sum of its proper divisors (178290531).

243123345 is a wasteful number, since it uses less digits than its factorization.

243123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402752 (or 5402749 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 243123345 is about 15592.4130589207. The cubic root of 243123345 is about 624.1307125702.

Adding to 243123345 its reverse (543321342), we get a palindrome (786444687).

The spelling of 243123345 in words is "two hundred forty-three million, one hundred twenty-three thousand, three hundred forty-five".