518644142 has 4 divisors (see below), whose sum is σ = 777966216. Its totient is φ = 259322070.

The previous prime is 518644141. The next prime is 518644151. The reversal of 518644142 is 241446815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241446815 = 5 ⋅48289363.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518644141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129661034 + ... + 129661037.

It is an arithmetic number, because the mean of its divisors is an integer number (194491554).

Almost surely, 2^518644142 is an apocalyptic number.

518644142 is a deficient number, since it is larger than the sum of its proper divisors (259322074).

518644142 is a wasteful number, since it uses less digits than its factorization.

518644142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259322073.

The product of its digits is 30720, while the sum is 35.

The square root of 518644142 is about 22773.7599442868. The cubic root of 518644142 is about 803.4456288710.

The spelling of 518644142 in words is "five hundred eighteen million, six hundred forty-four thousand, one hundred forty-two".