285748121 has 4 divisors (see below), whose sum is σ = 302556852. Its totient is φ = 268939392.

The previous prime is 285748063. The next prime is 285748249. The reversal of 285748121 is 121847582.

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 249987721 + 35760400 = 15811^2 + 5980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285748121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285748621) 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 3 ways as a sum of consecutive naturals, for example, 8404340 + ... + 8404373.

It is an arithmetic number, because the mean of its divisors is an integer number (75639213).

Almost surely, 2^285748121 is an apocalyptic number.

It is an amenable number.

285748121 is a deficient number, since it is larger than the sum of its proper divisors (16808731).

285748121 is a wasteful number, since it uses less digits than its factorization.

285748121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16808730.

The product of its digits is 35840, while the sum is 38.

The square root of 285748121 is about 16904.0859261896. The cubic root of 285748121 is about 658.6597542203.

The spelling of 285748121 in words is "two hundred eighty-five million, seven hundred forty-eight thousand, one hundred twenty-one".