285467221 has 4 divisors (see below), whose sum is σ = 307426252. Its totient is φ = 263508192.

The previous prime is 285467207. The next prime is 285467243. The reversal of 285467221 is 122764582.

It is a happy number.

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 74200996 + 211266225 = 8614^2 + 14535^2 .

It is a cyclic number.

It is not a de Polignac number, because 285467221 - 2⁷ = 285467093 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 (285467201) 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, 10979496 + ... + 10979521.

It is an arithmetic number, because the mean of its divisors is an integer number (76856563).

Almost surely, 2^285467221 is an apocalyptic number.

It is an amenable number.

285467221 is a deficient number, since it is larger than the sum of its proper divisors (21959031).

285467221 is a wasteful number, since it uses less digits than its factorization.

285467221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21959030.

The product of its digits is 53760, while the sum is 37.

The square root of 285467221 is about 16895.7752411661. The cubic root of 285467221 is about 658.4438552395.

The spelling of 285467221 in words is "two hundred eighty-five million, four hundred sixty-seven thousand, two hundred twenty-one".