218023811 has 2 divisors, whose sum is σ = 218023812. Its totient is φ = 218023810.

The previous prime is 218023787. The next prime is 218023823. The reversal of 218023811 is 118320812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218023811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218023891) 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 as a sum of consecutive naturals, namely, 109011905 + 109011906.

It is an arithmetic number, because the mean of its divisors is an integer number (109011906).

Almost surely, 2^218023811 is an apocalyptic number.

218023811 is a deficient number, since it is larger than the sum of its proper divisors (1).

218023811 is an equidigital number, since it uses as much as digits as its factorization.

218023811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 218023811 is about 14765.6293804226. The cubic root of 218023811 is about 601.8680768527.

The spelling of 218023811 in words is "two hundred eighteen million, twenty-three thousand, eight hundred eleven".