509349218 has 24 divisors (see below), whose sum is σ = 889695900. Its totient is φ = 218063328.

The previous prime is 509349193. The next prime is 509349227. The reversal of 509349218 is 812943905.

It can be written as a sum of positive squares in 2 ways, for example, as 299186209 + 210163009 = 17297^2 + 14497^2 .

It is a super-3 number, since 3×509349218³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118328 + ... + 122556.

Almost surely, 2^509349218 is an apocalyptic number.

509349218 is a deficient number, since it is larger than the sum of its proper divisors (380346682).

509349218 is a wasteful number, since it uses less digits than its factorization.

509349218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474 (or 5467 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 509349218 is about 22568.7664261918. The cubic root of 509349218 is about 798.6169948738.

The spelling of 509349218 in words is "five hundred nine million, three hundred forty-nine thousand, two hundred eighteen".