204551887 has 4 divisors (see below), whose sum is σ = 204694120. Its totient is φ = 204409656.

The previous prime is 204551881. The next prime is 204551909. The reversal of 204551887 is 788155402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788155402 = 2 ⋅394077701.

It is a cyclic number.

It is not a de Polignac number, because 204551887 - 2⁷ = 204551759 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 (204551881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68937 + ... + 71842.

It is an arithmetic number, because the mean of its divisors is an integer number (51173530).

Almost surely, 2^204551887 is an apocalyptic number.

204551887 is a deficient number, since it is larger than the sum of its proper divisors (142233).

204551887 is a wasteful number, since it uses less digits than its factorization.

204551887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142232.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 204551887 is about 14302.1637174240. The cubic root of 204551887 is about 589.2069081473.

The spelling of 204551887 in words is "two hundred four million, five hundred fifty-one thousand, eight hundred eighty-seven".