518281989 has 8 divisors (see below), whose sum is σ = 693251712. Its totient is φ = 344416800.

The previous prime is 518281987. The next prime is 518281993. The reversal of 518281989 is 989182815.

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

It is not a de Polignac number, because 518281989 - 2¹ = 518281987 is a prime.

It is a super-2 number, since 2×518281989² = 537232440243592242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518281987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275037 + ... + 276914.

It is an arithmetic number, because the mean of its divisors is an integer number (86656464).

Almost surely, 2^518281989 is an apocalyptic number.

It is an amenable number.

518281989 is a deficient number, since it is larger than the sum of its proper divisors (174969723).

518281989 is a wasteful number, since it uses less digits than its factorization.

518281989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552267.

The product of its digits is 414720, while the sum is 51.

The square root of 518281989 is about 22765.8074532840. The cubic root of 518281989 is about 803.2585783337.

The spelling of 518281989 in words is "five hundred eighteen million, two hundred eighty-one thousand, nine hundred eighty-nine".