905221 has 4 divisors (see below), whose sum is σ = 907200. Its totient is φ = 903244.

The previous prime is 905213. The next prime is 905227. The reversal of 905221 is 122509.

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 905221 - 2³ = 905213 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 (905227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (226800).

2⁹⁰⁵²²¹ is an apocalyptic number.

It is an amenable number.

905221 is a deficient number, since it is larger than the sum of its proper divisors (1979).

905221 is a wasteful number, since it uses less digits than its factorization.

905221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 905221 is about 951.4310274529. The cubic root of 905221 is about 96.7352756427.

The spelling of 905221 in words is "nine hundred five thousand, two hundred twenty-one".