204062561 has 4 divisors (see below), whose sum is σ = 207912852. Its totient is φ = 200212272.

The previous prime is 204062539. The next prime is 204062569. The reversal of 204062561 is 165260402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165260402 = 2 ⋅82630201.

It can be written as a sum of positive squares in 2 ways, for example, as 151413025 + 52649536 = 12305^2 + 7256^2 .

It is a cyclic number.

It is not a de Polignac number, because 204062561 - 2¹⁰ = 204061537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204062561.

It is not an unprimeable number, because it can be changed into a prime (204062569) 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, 1925066 + ... + 1925171.

It is an arithmetic number, because the mean of its divisors is an integer number (51978213).

Almost surely, 2^204062561 is an apocalyptic number.

It is an amenable number.

204062561 is a deficient number, since it is larger than the sum of its proper divisors (3850291).

204062561 is an equidigital number, since it uses as much as digits as its factorization.

204062561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850290.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 204062561 is about 14285.0467622616. The cubic root of 204062561 is about 588.7367023230.

The spelling of 204062561 in words is "two hundred four million, sixty-two thousand, five hundred sixty-one".