904661 has 2 divisors, whose sum is σ = 904662. Its totient is φ = 904660.

The previous prime is 904643. The next prime is 904663. The reversal of 904661 is 166409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 255025 = 806^2 + 505^2 .

It is an emirp because it is prime and its reverse (166409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 904661 - 2¹⁸ = 642517 is a prime.

It is a Sophie Germain prime.

Together with 904663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 904661.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 904661.

It is not a weakly prime, because it can be changed into another prime (904663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452330 + 452331.

It is an arithmetic number, because the mean of its divisors is an integer number (452331).

2⁹⁰⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

904661 is a deficient number, since it is larger than the sum of its proper divisors (1).

904661 is an equidigital number, since it uses as much as digits as its factorization.

904661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 904661 is about 951.1366883892. The cubic root of 904661 is about 96.7153236350.

The spelling of 904661 in words is "nine hundred four thousand, six hundred sixty-one".