518273242 has 4 divisors (see below), whose sum is σ = 777409866. Its totient is φ = 259136620.

The previous prime is 518273153. The next prime is 518273243. The reversal of 518273242 is 242372815.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242372815 = 5 ⋅48474563.

It can be written as a sum of positive squares in only one way, i.e., 487570561 + 30702681 = 22081^2 + 5541^2 .

It is a junction number, because it is equal to n+sod(n) for n = 518273198 and 518273207.

It is not an unprimeable number, because it can be changed into a prime (518273243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129568309 + ... + 129568312.

Almost surely, 2^518273242 is an apocalyptic number.

518273242 is a deficient number, since it is larger than the sum of its proper divisors (259136624).

518273242 is a wasteful number, since it uses less digits than its factorization.

518273242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259136623.

The product of its digits is 26880, while the sum is 34.

The square root of 518273242 is about 22765.6153441984. The cubic root of 518273242 is about 803.2540594666.

The spelling of 518273242 in words is "five hundred eighteen million, two hundred seventy-three thousand, two hundred forty-two".