285671221 has 16 divisors (see below), whose sum is σ = 318314880. Its totient is φ = 254200320.

The previous prime is 285671161. The next prime is 285671249. The reversal of 285671221 is 122176582.

It is a happy number.

It is not a de Polignac number, because 285671221 - 2¹⁷ = 285540149 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 (285671021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99421 + ... + 102253.

It is an arithmetic number, because the mean of its divisors is an integer number (19894680).

Almost surely, 2^285671221 is an apocalyptic number.

It is an amenable number.

285671221 is a deficient number, since it is larger than the sum of its proper divisors (32643659).

285671221 is a wasteful number, since it uses less digits than its factorization.

285671221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036.

The product of its digits is 13440, while the sum is 34.

The square root of 285671221 is about 16901.8111751374. The cubic root of 285671221 is about 658.6006631587.

The spelling of 285671221 in words is "two hundred eighty-five million, six hundred seventy-one thousand, two hundred twenty-one".