218501530 has 32 divisors (see below), whose sum is σ = 426400128. Its totient is φ = 80136000.

The previous prime is 218501519. The next prime is 218501537. The reversal of 218501530 is 35105812.

It is a happy number.

It is a super-2 number, since 2×218501530² = 95485837224681800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 218501495 and 218501504.

It is not an unprimeable number, because it can be changed into a prime (218501537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14065 + ... + 25195.

It is an arithmetic number, because the mean of its divisors is an integer number (13325004).

Almost surely, 2^218501530 is an apocalyptic number.

218501530 is a deficient number, since it is larger than the sum of its proper divisors (207898598).

218501530 is a wasteful number, since it uses less digits than its factorization.

218501530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11302.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 218501530 is about 14781.7972520259. The cubic root of 218501530 is about 602.3073470236.

The spelling of 218501530 in words is "two hundred eighteen million, five hundred one thousand, five hundred thirty".