204112551 has 4 divisors (see below), whose sum is σ = 272150072. Its totient is φ = 136075032.

The previous prime is 204112507. The next prime is 204112583. The reversal of 204112551 is 155211402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 204112551 - 2⁷ = 204112423 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 (204112751) 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, 34018756 + ... + 34018761.

It is an arithmetic number, because the mean of its divisors is an integer number (68037518).

Almost surely, 2^204112551 is an apocalyptic number.

204112551 is a deficient number, since it is larger than the sum of its proper divisors (68037521).

204112551 is an equidigital number, since it uses as much as digits as its factorization.

204112551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68037520.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 204112551 is about 14286.7963868741. The cubic root of 204112551 is about 588.7847734385.

Adding to 204112551 its reverse (155211402), we get a palindrome (359323953).

The spelling of 204112551 in words is "two hundred four million, one hundred twelve thousand, five hundred fifty-one".