204153557 has 4 divisors (see below), whose sum is σ = 204239040. Its totient is φ = 204068076.

The previous prime is 204153529. The next prime is 204153559. The reversal of 204153557 is 755351402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204153557 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 (204153559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39053 + ... + 43970.

It is an arithmetic number, because the mean of its divisors is an integer number (51059760).

Almost surely, 2^204153557 is an apocalyptic number.

It is an amenable number.

204153557 is a deficient number, since it is larger than the sum of its proper divisors (85483).

204153557 is an equidigital number, since it uses as much as digits as its factorization.

204153557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85482.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 204153557 is about 14288.2314160991. The cubic root of 204153557 is about 588.8241995487.

The spelling of 204153557 in words is "two hundred four million, one hundred fifty-three thousand, five hundred fifty-seven".