518221207 has 32 divisors (see below), whose sum is σ = 620928000. Its totient is φ = 432208224.

The previous prime is 518221199. The next prime is 518221241. The reversal of 518221207 is 702122815.

It is not a de Polignac number, because 518221207 - 2³ = 518221199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518221247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3103038 + ... + 3103204.

It is an arithmetic number, because the mean of its divisors is an integer number (19404000).

Almost surely, 2^518221207 is an apocalyptic number.

518221207 is a deficient number, since it is larger than the sum of its proper divisors (102706793).

518221207 is a wasteful number, since it uses less digits than its factorization.

518221207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 518221207 is about 22764.4724735716. The cubic root of 518221207 is about 803.2271761417.

The spelling of 518221207 in words is "five hundred eighteen million, two hundred twenty-one thousand, two hundred seven".