904571921 has 12 divisors (see below), whose sum is σ = 1052771076. Its totient is φ = 773963520.

The previous prime is 904571911. The next prime is 904571929. The reversal of 904571921 is 129175409.

904571921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 639533521 + 265038400 = 25289^2 + 16280^2 .

It is not a de Polignac number, because 904571921 - 2¹⁰ = 904570897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (904571929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217820 + ... + 221933.

It is an arithmetic number, because the mean of its divisors is an integer number (87730923).

Almost surely, 2^904571921 is an apocalyptic number.

It is an amenable number.

904571921 is a deficient number, since it is larger than the sum of its proper divisors (148199155).

904571921 is a wasteful number, since it uses less digits than its factorization.

904571921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439792 (or 439781 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 904571921 is about 30076.1021576932. The cubic root of 904571921 is about 967.1214911733.

The spelling of 904571921 in words is "nine hundred four million, five hundred seventy-one thousand, nine hundred twenty-one".