218550813 has 8 divisors (see below), whose sum is σ = 313816608. Its totient is φ = 134492784.

The previous prime is 218550791. The next prime is 218550847. The reversal of 218550813 is 318055812.

It is a happy number.

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

It is not a de Polignac number, because 218550813 - 2⁵ = 218550781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218550613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2801895 + ... + 2801972.

It is an arithmetic number, because the mean of its divisors is an integer number (39227076).

Almost surely, 2^218550813 is an apocalyptic number.

It is an amenable number.

218550813 is a deficient number, since it is larger than the sum of its proper divisors (95265795).

218550813 is a wasteful number, since it uses less digits than its factorization.

218550813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5603883.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 218550813 is about 14783.4641745431. The cubic root of 218550813 is about 602.3526270751.

The spelling of 218550813 in words is "two hundred eighteen million, five hundred fifty thousand, eight hundred thirteen".