243105305138 has 8 divisors (see below), whose sum is σ = 366980620332. Its totient is φ = 120778431696.

The previous prime is 243105305089. The next prime is 243105305213. The reversal of 243105305138 is 831503501342.

It can be written as a sum of positive squares in 2 ways, for example, as 189962607409 + 53142697729 = 435847^2 + 230527^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 243105305098 and 243105305107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387110045 + ... + 387110672.

Almost surely, 2^243105305138 is an apocalyptic number.

243105305138 is a deficient number, since it is larger than the sum of its proper divisors (123875315194).

243105305138 is a wasteful number, since it uses less digits than its factorization.

243105305138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774220876.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 243105305138 in words is "two hundred forty-three billion, one hundred five million, three hundred five thousand, one hundred thirty-eight".