285006812989 has 4 divisors (see below), whose sum is σ = 286066318140. Its totient is φ = 283947307840.

The previous prime is 285006812971. The next prime is 285006813019. The reversal of 285006812989 is 989218600582.

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 8374995225 + 276631817764 = 91515^2 + 525958^2 .

It is a cyclic number.

It is not a de Polignac number, because 285006812989 - 2⁵ = 285006812957 is a prime.

It is a super-2 number, since 2×285006812989² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285006812939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529752172 + ... + 529752709.

It is an arithmetic number, because the mean of its divisors is an integer number (71516579535).

Almost surely, 2^285006812989 is an apocalyptic number.

It is an amenable number.

285006812989 is a deficient number, since it is larger than the sum of its proper divisors (1059505151).

285006812989 is a wasteful number, since it uses less digits than its factorization.

285006812989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059505150.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 285006812989 in words is "two hundred eighty-five billion, six million, eight hundred twelve thousand, nine hundred eighty-nine".