204155551 has 8 divisors (see below), whose sum is σ = 215475200. Its totient is φ = 192893400.

The previous prime is 204155537. The next prime is 204155569. The reversal of 204155551 is 155551402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204155551 is a prime.

It is a super-2 number, since 2×204155551² = 83358978008227202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204155531) 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, 6975 + ... + 21376.

It is an arithmetic number, because the mean of its divisors is an integer number (26934400).

Almost surely, 2^204155551 is an apocalyptic number.

204155551 is a deficient number, since it is larger than the sum of its proper divisors (11319649).

204155551 is a wasteful number, since it uses less digits than its factorization.

204155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28749.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 204155551 is about 14288.3011936339. The cubic root of 204155551 is about 588.8261165887.

The spelling of 204155551 in words is "two hundred four million, one hundred fifty-five thousand, five hundred fifty-one".