204115551 has 8 divisors (see below), whose sum is σ = 272485680. Its totient is φ = 135911232.

The previous prime is 204115531. The next prime is 204115573. The reversal of 204115551 is 155511402.

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

It is not a de Polignac number, because 204115551 - 2⁶ = 204115487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204115511) 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, 38550 + ... + 43523.

It is an arithmetic number, because the mean of its divisors is an integer number (34060710).

Almost surely, 2^204115551 is an apocalyptic number.

204115551 is a deficient number, since it is larger than the sum of its proper divisors (68370129).

204115551 is an equidigital number, since it uses as much as digits as its factorization.

204115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82905.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 204115551 is about 14286.9013785355. The cubic root of 204115551 is about 588.7876580327.

Adding to 204115551 its reverse (155511402), we get a palindrome (359626953).

The spelling of 204115551 in words is "two hundred four million, one hundred fifteen thousand, five hundred fifty-one".