218204851 has 2 divisors, whose sum is σ = 218204852. Its totient is φ = 218204850.

The previous prime is 218204839. The next prime is 218204881. The reversal of 218204851 is 158402812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218204851 - 2¹⁵ = 218172083 is a prime.

It is a super-2 number, since 2×218204851² = 95226713999864402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218204801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109102425 + 109102426.

It is an arithmetic number, because the mean of its divisors is an integer number (109102426).

Almost surely, 2^218204851 is an apocalyptic number.

218204851 is a deficient number, since it is larger than the sum of its proper divisors (1).

218204851 is an equidigital number, since it uses as much as digits as its factorization.

218204851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 218204851 is about 14771.7585615254. The cubic root of 218204851 is about 602.0346214310.

The spelling of 218204851 in words is "two hundred eighteen million, two hundred four thousand, eight hundred fifty-one".