218382449 has 2 divisors, whose sum is σ = 218382450. Its totient is φ = 218382448.

The previous prime is 218382431. The next prime is 218382491. The reversal of 218382449 is 944283812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192321424 + 26061025 = 13868^2 + 5105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218382449 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (218382049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109191224 + 109191225.

It is an arithmetic number, because the mean of its divisors is an integer number (109191225).

Almost surely, 2^218382449 is an apocalyptic number.

It is an amenable number.

218382449 is a deficient number, since it is larger than the sum of its proper divisors (1).

218382449 is an equidigital number, since it uses as much as digits as its factorization.

218382449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 41.

The square root of 218382449 is about 14777.7687422696. The cubic root of 218382449 is about 602.1979101170.

The spelling of 218382449 in words is "two hundred eighteen million, three hundred eighty-two thousand, four hundred forty-nine".