285862384921 has 3 divisors (see below), whose sum is σ = 285862919583. Its totient is φ = 285861850260.

The previous prime is 285862384909. The next prime is 285862384949. The reversal of 285862384921 is 129483268582.

The square root of 285862384921 is 534661.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 211038253321 + 74824131600 = 459389^2 + 273540^2 .

It is not a de Polignac number, because 285862384921 - 2⁷ = 285862384793 is a prime.

It is a super-2 number, since 2×285862384921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285862384121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 267331 + ... + 801991.

It is an arithmetic number, because the mean of its divisors is an integer number (95287639861).

Almost surely, 2^285862384921 is an apocalyptic number.

285862384921 is the 534661-st square number.

285862384921 is the 267331-st centered octagonal number.

It is an amenable number.

285862384921 is a deficient number, since it is larger than the sum of its proper divisors (534662).

285862384921 is an frugal number, since it uses more digits than its factorization.

285862384921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069322 (or 534661 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 58.

The spelling of 285862384921 in words is "two hundred eighty-five billion, eight hundred sixty-two million, three hundred eighty-four thousand, nine hundred twenty-one".