204153561 has 32 divisors (see below), whose sum is σ = 321753600. Its totient is φ = 127491840.

The previous prime is 204153559. The next prime is 204153583. The reversal of 204153561 is 165351402.

It is not a de Polignac number, because 204153561 - 2¹ = 204153559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (204153361) 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 31 ways as a sum of consecutive naturals, for example, 108771 + ... + 110631.

It is an arithmetic number, because the mean of its divisors is an integer number (10054800).

Almost surely, 2^204153561 is an apocalyptic number.

It is an amenable number.

204153561 is a deficient number, since it is larger than the sum of its proper divisors (117600039).

204153561 is a wasteful number, since it uses less digits than its factorization.

204153561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126 (or 2120 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 204153561 is about 14288.2315560744. The cubic root of 204153561 is about 588.8242033943.

The spelling of 204153561 in words is "two hundred four million, one hundred fifty-three thousand, five hundred sixty-one".