204219997 has 4 divisors (see below), whose sum is σ = 216232956. Its totient is φ = 192207040.

The previous prime is 204219991. The next prime is 204220007. The reversal of 204219997 is 799912402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84842521 + 119377476 = 9211^2 + 10926^2 .

It is a cyclic number.

It is not a de Polignac number, because 204219997 - 2²⁷ = 70002269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204219991) 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, 6006454 + ... + 6006487.

It is an arithmetic number, because the mean of its divisors is an integer number (54058239).

Almost surely, 2^204219997 is an apocalyptic number.

It is an amenable number.

204219997 is a deficient number, since it is larger than the sum of its proper divisors (12012959).

204219997 is a wasteful number, since it uses less digits than its factorization.

204219997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12012958.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 204219997 is about 14290.5562173066. The cubic root of 204219997 is about 588.8880685259. Note that the first 3 decimals are identical.

The spelling of 204219997 in words is "two hundred four million, two hundred nineteen thousand, nine hundred ninety-seven".