218861053 has 4 divisors (see below), whose sum is σ = 218925180. Its totient is φ = 218796928.

The previous prime is 218861051. The next prime is 218861087. The reversal of 218861053 is 350168812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97574884 + 121286169 = 9878^2 + 11013^2 .

It is a cyclic number.

It is not a de Polignac number, because 218861053 - 2¹ = 218861051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218861051) 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, 26638 + ... + 33871.

It is an arithmetic number, because the mean of its divisors is an integer number (54731295).

Almost surely, 2^218861053 is an apocalyptic number.

It is an amenable number.

218861053 is a deficient number, since it is larger than the sum of its proper divisors (64127).

218861053 is an equidigital number, since it uses as much as digits as its factorization.

218861053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64126.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 218861053 is about 14793.9532580038. The cubic root of 218861053 is about 602.6375120432.

The spelling of 218861053 in words is "two hundred eighteen million, eight hundred sixty-one thousand, fifty-three".