204642461 has 4 divisors (see below), whose sum is σ = 209401632. Its totient is φ = 199883292.

The previous prime is 204642457. The next prime is 204642467. The reversal of 204642461 is 164246402.

It is a happy number.

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 not a de Polignac number, because 204642461 - 2² = 204642457 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 (204642467) 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, 2379521 + ... + 2379606.

It is an arithmetic number, because the mean of its divisors is an integer number (52350408).

Almost surely, 2^204642461 is an apocalyptic number.

It is an amenable number.

204642461 is a deficient number, since it is larger than the sum of its proper divisors (4759171).

204642461 is an equidigital number, since it uses as much as digits as its factorization.

204642461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759170.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 204642461 is about 14305.3298109481. The cubic root of 204642461 is about 589.2938607415.

Adding to 204642461 its reverse (164246402), we get a palindrome (368888863).

The spelling of 204642461 in words is "two hundred four million, six hundred forty-two thousand, four hundred sixty-one".