218522449 has 2 divisors, whose sum is σ = 218522450. Its totient is φ = 218522448.

The previous prime is 218522429. The next prime is 218522459. The reversal of 218522449 is 944225812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217356049 + 1166400 = 14743^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 218522449 - 2⁷ = 218522321 is a prime.

It is not a weakly prime, because it can be changed into another prime (218522429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109261224 + 109261225.

It is an arithmetic number, because the mean of its divisors is an integer number (109261225).

Almost surely, 2^218522449 is an apocalyptic number.

It is an amenable number.

218522449 is a deficient number, since it is larger than the sum of its proper divisors (1).

218522449 is an equidigital number, since it uses as much as digits as its factorization.

218522449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 218522449 is about 14782.5048283435. The cubic root of 218522449 is about 602.3265677362.

The spelling of 218522449 in words is "two hundred eighteen million, five hundred twenty-two thousand, four hundred forty-nine".