204939591 has 16 divisors (see below), whose sum is σ = 291768576. Its totient is φ = 127645056.

The previous prime is 204939571. The next prime is 204939601. The reversal of 204939591 is 195939402.

It is not a de Polignac number, because 204939591 - 2⁷ = 204939463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204939541) 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 15 ways as a sum of consecutive naturals, for example, 31570 + ... + 37503.

It is an arithmetic number, because the mean of its divisors is an integer number (18235536).

Almost surely, 2^204939591 is an apocalyptic number.

204939591 is a deficient number, since it is larger than the sum of its proper divisors (86828985).

204939591 is a wasteful number, since it uses less digits than its factorization.

204939591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69142.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 204939591 is about 14315.7113340553. The cubic root of 204939591 is about 589.5789306279.

The spelling of 204939591 in words is "two hundred four million, nine hundred thirty-nine thousand, five hundred ninety-one".