218090811 has 16 divisors (see below), whose sum is σ = 293416704. Its totient is φ = 144085344.

The previous prime is 218090801. The next prime is 218090819. The reversal of 218090811 is 118090812.

It is not a de Polignac number, because 218090811 - 2¹¹ = 218088763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218090819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321805 + ... + 322481.

It is an arithmetic number, because the mean of its divisors is an integer number (18338544).

Almost surely, 2^218090811 is an apocalyptic number.

218090811 is a deficient number, since it is larger than the sum of its proper divisors (75325893).

218090811 is a wasteful number, since it uses less digits than its factorization.

218090811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 218090811 is about 14767.8979885426. The cubic root of 218090811 is about 601.9297230722.

Subtracting from 218090811 its reverse (118090812), we obtain a palindrome (99999999).

The spelling of 218090811 in words is "two hundred eighteen million, ninety thousand, eight hundred eleven".