906221 has 4 divisors (see below), whose sum is σ = 937500. Its totient is φ = 874944.

The previous prime is 906211. The next prime is 906229. The reversal of 906221 is 122609.

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

It can be written as a sum of positive squares in 2 ways, for example, as 532900 + 373321 = 730^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 906221 - 2¹⁰ = 905197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 906193 and 906202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906229) 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, 15596 + ... + 15653.

It is an arithmetic number, because the mean of its divisors is an integer number (234375).

2⁹⁰⁶²²¹ is an apocalyptic number.

It is an amenable number.

906221 is a deficient number, since it is larger than the sum of its proper divisors (31279).

906221 is a wasteful number, since it uses less digits than its factorization.

906221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31278.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 906221 is about 951.9564065649. The cubic root of 906221 is about 96.7708837709.

The spelling of 906221 in words is "nine hundred six thousand, two hundred twenty-one".