204189551 has 8 divisors (see below), whose sum is σ = 211394880. Its totient is φ = 196995232.

The previous prime is 204189547. The next prime is 204189563. The reversal of 204189551 is 155981402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204189551 - 2² = 204189547 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 (204189521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58121 + ... + 61533.

It is an arithmetic number, because the mean of its divisors is an integer number (26424360).

Almost surely, 2^204189551 is an apocalyptic number.

204189551 is a deficient number, since it is larger than the sum of its proper divisors (7205329).

204189551 is a wasteful number, since it uses less digits than its factorization.

204189551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 204189551 is about 14289.4909286510. The cubic root of 204189551 is about 588.8588024118.

The spelling of 204189551 in words is "two hundred four million, one hundred eighty-nine thousand, five hundred fifty-one".