218009552 has 20 divisors (see below), whose sum is σ = 422623620. Its totient is φ = 108945408.

The previous prime is 218009551. The next prime is 218009557. The reversal of 218009552 is 255900812.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 130325056 = 9364^2 + 11416^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218009551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51218 + ... + 55310.

It is an arithmetic number, because the mean of its divisors is an integer number (21131181).

Almost surely, 2^218009552 is an apocalyptic number.

It is an amenable number.

218009552 is a deficient number, since it is larger than the sum of its proper divisors (204614068).

218009552 is a wasteful number, since it uses less digits than its factorization.

218009552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7430 (or 7424 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 218009552 is about 14765.1465282265. The cubic root of 218009552 is about 601.8549556192.

The spelling of 218009552 in words is "two hundred eighteen million, nine thousand, five hundred fifty-two".