218141057 has 4 divisors (see below), whose sum is σ = 222256980. Its totient is φ = 214025136.

The previous prime is 218141029. The next prime is 218141081. The reversal of 218141057 is 750141812.

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 63984001 + 154157056 = 7999^2 + 12416^2 .

It is a cyclic number.

It is not a de Polignac number, because 218141057 - 2⁸ = 218140801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218141087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057882 + ... + 2057987.

It is an arithmetic number, because the mean of its divisors is an integer number (55564245).

Almost surely, 2^218141057 is an apocalyptic number.

It is an amenable number.

218141057 is a deficient number, since it is larger than the sum of its proper divisors (4115923).

218141057 is an equidigital number, since it uses as much as digits as its factorization.

218141057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115922.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 218141057 is about 14769.5990805438. The cubic root of 218141057 is about 601.9759457724.

Adding to 218141057 its reverse (750141812), we get a palindrome (968282869).

The spelling of 218141057 in words is "two hundred eighteen million, one hundred forty-one thousand, fifty-seven".