218090077 has 2 divisors, whose sum is σ = 218090078. Its totient is φ = 218090076.

The previous prime is 218090057. The next prime is 218090083. The reversal of 218090077 is 770090812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185531641 + 32558436 = 13621^2 + 5706^2 .

It is a cyclic number.

It is not a de Polignac number, because 218090077 - 2¹¹ = 218088029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218090017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109045038 + 109045039.

It is an arithmetic number, because the mean of its divisors is an integer number (109045039).

Almost surely, 2^218090077 is an apocalyptic number.

It is an amenable number.

218090077 is a deficient number, since it is larger than the sum of its proper divisors (1).

218090077 is an equidigital number, since it uses as much as digits as its factorization.

218090077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 218090077 is about 14767.8731373208. The cubic root of 218090077 is about 601.9290477925.

The spelling of 218090077 in words is "two hundred eighteen million, ninety thousand, seventy-seven".