204662861 has 4 divisors (see below), whose sum is σ = 220406172. Its totient is φ = 188919552.

The previous prime is 204662827. The next prime is 204662879. The reversal of 204662861 is 168266402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29920900 + 174741961 = 5470^2 + 13219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204662861 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 (204662891) 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, 7871636 + ... + 7871661.

It is an arithmetic number, because the mean of its divisors is an integer number (55101543).

Almost surely, 2^204662861 is an apocalyptic number.

It is an amenable number.

204662861 is a deficient number, since it is larger than the sum of its proper divisors (15743311).

204662861 is a wasteful number, since it uses less digits than its factorization.

204662861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15743310.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 204662861 is about 14306.0428141398. The cubic root of 204662861 is about 589.3134415513.

The spelling of 204662861 in words is "two hundred four million, six hundred sixty-two thousand, eight hundred sixty-one".