518381229 has 4 divisors (see below), whose sum is σ = 691174976. Its totient is φ = 345587484.

The previous prime is 518381203. The next prime is 518381243. The reversal of 518381229 is 922183815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 518381229 - 2⁵ = 518381197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518381029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86396869 + ... + 86396874.

It is an arithmetic number, because the mean of its divisors is an integer number (172793744).

Almost surely, 2^518381229 is an apocalyptic number.

It is an amenable number.

518381229 is a deficient number, since it is larger than the sum of its proper divisors (172793747).

518381229 is a wasteful number, since it uses less digits than its factorization.

518381229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172793746.

The product of its digits is 34560, while the sum is 39.

The square root of 518381229 is about 22767.9869334116. The cubic root of 518381229 is about 803.3098440511.

The spelling of 518381229 in words is "five hundred eighteen million, three hundred eighty-one thousand, two hundred twenty-nine".