204261989 has 4 divisors (see below), whose sum is σ = 215012640. Its totient is φ = 193511340.

The previous prime is 204261973. The next prime is 204262033. The reversal of 204261989 is 989162402.

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 204261989 - 2⁴ = 204261973 is a prime.

It is a super-2 number, since 2×204261989² = 83445920300472242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204261949) 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, 5375297 + ... + 5375334.

It is an arithmetic number, because the mean of its divisors is an integer number (53753160).

Almost surely, 2^204261989 is an apocalyptic number.

It is an amenable number.

204261989 is a deficient number, since it is larger than the sum of its proper divisors (10750651).

204261989 is a wasteful number, since it uses less digits than its factorization.

204261989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750650.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 204261989 is about 14292.0253638174. The cubic root of 204261989 is about 588.9284284212.

The spelling of 204261989 in words is "two hundred four million, two hundred sixty-one thousand, nine hundred eighty-nine".