219418249 has 2 divisors, whose sum is σ = 219418250. Its totient is φ = 219418248.

The previous prime is 219418247. The next prime is 219418253. The reversal of 219418249 is 942814912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121705024 + 97713225 = 11032^2 + 9885^2 .

It is a cyclic number.

It is not a de Polignac number, because 219418249 - 2¹ = 219418247 is a prime.

Together with 219418247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (219418247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109709124 + 109709125.

It is an arithmetic number, because the mean of its divisors is an integer number (109709125).

Almost surely, 2^219418249 is an apocalyptic number.

It is an amenable number.

219418249 is a deficient number, since it is larger than the sum of its proper divisors (1).

219418249 is an equidigital number, since it uses as much as digits as its factorization.

219418249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 219418249 is about 14812.7731704769. The cubic root of 219418249 is about 603.1484947723.

The spelling of 219418249 in words is "two hundred nineteen million, four hundred eighteen thousand, two hundred forty-nine".