218019077 has 2 divisors, whose sum is σ = 218019078. Its totient is φ = 218019076.

The previous prime is 218019037. The next prime is 218019079. The reversal of 218019077 is 770910812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215091556 + 2927521 = 14666^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 218019077 - 2²⁶ = 150910213 is a prime.

Together with 218019079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218019079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109009538 + 109009539.

It is an arithmetic number, because the mean of its divisors is an integer number (109009539).

Almost surely, 2^218019077 is an apocalyptic number.

It is an amenable number.

218019077 is a deficient number, since it is larger than the sum of its proper divisors (1).

218019077 is an equidigital number, since it uses as much as digits as its factorization.

218019077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 218019077 is about 14765.4690748381. The cubic root of 218019077 is about 601.8637206556.

Adding to 218019077 its reverse (770910812), we get a palindrome (988929889).

The spelling of 218019077 in words is "two hundred eighteen million, nineteen thousand, seventy-seven".