285853221 has 12 divisors (see below), whose sum is σ = 420690348. Its totient is φ = 186972864.

The previous prime is 285853213. The next prime is 285853229. The reversal of 285853221 is 122358582.

285853221 is a `hidden beast` number, since 28 + 585 + 32 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (285853213) and next prime (285853229).

It can be written as a sum of positive squares in 2 ways, for example, as 155002500 + 130850721 = 12450^2 + 11439^2 .

It is not a de Polignac number, because 285853221 - 2³ = 285853213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285853229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299160 + ... + 300113.

It is an arithmetic number, because the mean of its divisors is an integer number (35057529).

Almost surely, 2^285853221 is an apocalyptic number.

It is an amenable number.

285853221 is a deficient number, since it is larger than the sum of its proper divisors (134837127).

285853221 is a wasteful number, since it uses less digits than its factorization.

285853221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599332 (or 599329 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 285853221 is about 16907.1943562496. The cubic root of 285853221 is about 658.7404974223.

The spelling of 285853221 in words is "two hundred eighty-five million, eight hundred fifty-three thousand, two hundred twenty-one".