218516057 has 2 divisors, whose sum is σ = 218516058. Its totient is φ = 218516056.

The previous prime is 218516003. The next prime is 218516063. The reversal of 218516057 is 750615812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212110096 + 6405961 = 14564^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 218516057 - 2²² = 214321753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218516087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109258028 + 109258029.

It is an arithmetic number, because the mean of its divisors is an integer number (109258029).

Almost surely, 2^218516057 is an apocalyptic number.

It is an amenable number.

218516057 is a deficient number, since it is larger than the sum of its proper divisors (1).

218516057 is an equidigital number, since it uses as much as digits as its factorization.

218516057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 218516057 is about 14782.2886252434. The cubic root of 218516057 is about 602.3206947943.

The spelling of 218516057 in words is "two hundred eighteen million, five hundred sixteen thousand, fifty-seven".