218111041 has 4 divisors (see below), whose sum is σ = 224005972. Its totient is φ = 212216112.

The previous prime is 218111039. The next prime is 218111057. The reversal of 218111041 is 140111812.

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 132733441 + 85377600 = 11521^2 + 9240^2 .

It is a cyclic number.

It is not a de Polignac number, because 218111041 - 2¹ = 218111039 is a prime.

It is a super-2 number, since 2×218111041² = 95144852412207362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218111941) 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, 2947410 + ... + 2947483.

It is an arithmetic number, because the mean of its divisors is an integer number (56001493).

Almost surely, 2^218111041 is an apocalyptic number.

It is an amenable number.

218111041 is a deficient number, since it is larger than the sum of its proper divisors (5894931).

218111041 is an equidigital number, since it uses as much as digits as its factorization.

218111041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5894930.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 218111041 is about 14768.5829042600. The cubic root of 218111041 is about 601.9483340685.

Adding to 218111041 its reverse (140111812), we get a palindrome (358222853).

The spelling of 218111041 in words is "two hundred eighteen million, one hundred eleven thousand, forty-one".