204656671 has 4 divisors (see below), whose sum is σ = 204831144. Its totient is φ = 204482200.

The previous prime is 204656629. The next prime is 204656677. The reversal of 204656671 is 176656402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 204656671 - 2¹¹ = 204654623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204656671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204656677) 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, 85465 + ... + 87826.

It is an arithmetic number, because the mean of its divisors is an integer number (51207786).

Almost surely, 2^204656671 is an apocalyptic number.

204656671 is a deficient number, since it is larger than the sum of its proper divisors (174473).

204656671 is a wasteful number, since it uses less digits than its factorization.

204656671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174472.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 204656671 is about 14305.8264703582. The cubic root of 204656671 is about 589.3075002568.

The spelling of 204656671 in words is "two hundred four million, six hundred fifty-six thousand, six hundred seventy-one".