287852121 has 24 divisors (see below), whose sum is σ = 422787144. Its totient is φ = 188697600.

The previous prime is 287852099. The next prime is 287852129. The reversal of 287852121 is 121258782.

It can be written as a sum of positive squares in 4 ways, for example, as 139499721 + 148352400 = 11811^2 + 12180^2 .

It is not a de Polignac number, because 287852121 - 2⁹ = 287851609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (287852129) 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 23 ways as a sum of consecutive naturals, for example, 141705 + ... + 143721.

It is an arithmetic number, because the mean of its divisors is an integer number (17616131).

Almost surely, 2^287852121 is an apocalyptic number.

It is an amenable number.

287852121 is a deficient number, since it is larger than the sum of its proper divisors (134935023).

287852121 is a wasteful number, since it uses less digits than its factorization.

287852121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281 (or 2278 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 287852121 is about 16966.2052622264. The cubic root of 287852121 is about 660.2724013306.

The spelling of 287852121 in words is "two hundred eighty-seven million, eight hundred fifty-two thousand, one hundred twenty-one".