219942249 has 4 divisors (see below), whose sum is σ = 293256336. Its totient is φ = 146628164.

The previous prime is 219942227. The next prime is 219942251. The reversal of 219942249 is 942249912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 219942249 - 2⁹ = 219941737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 219942249.

It is not an unprimeable number, because it can be changed into a prime (219942269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36657039 + ... + 36657044.

It is an arithmetic number, because the mean of its divisors is an integer number (73314084).

Almost surely, 2^219942249 is an apocalyptic number.

It is an amenable number.

219942249 is a deficient number, since it is larger than the sum of its proper divisors (73314087).

219942249 is an equidigital number, since it uses as much as digits as its factorization.

219942249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73314086.

The product of its digits is 93312, while the sum is 42.

The square root of 219942249 is about 14830.4500606017. The cubic root of 219942249 is about 603.6282460484.

The spelling of 219942249 in words is "two hundred nineteen million, nine hundred forty-two thousand, two hundred forty-nine".