2805281989 has 4 divisors (see below), whose sum is σ = 2806483680. Its totient is φ = 2804080300.

The previous prime is 2805281987. The next prime is 2805282049. The reversal of 2805281989 is 9891825082.

2805281989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2805281989 - 2¹ = 2805281987 is a prime.

It is a super-2 number, since 2×2805281989² = 15739214075615592242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805281987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597337 + ... + 602014.

It is an arithmetic number, because the mean of its divisors is an integer number (701620920).

Almost surely, 2^2805281989 is an apocalyptic number.

It is an amenable number.

2805281989 is a deficient number, since it is larger than the sum of its proper divisors (1201691).

2805281989 is a wasteful number, since it uses less digits than its factorization.

2805281989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201690.

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 2805281989 is about 52964.9128102747. The cubic root of 2805281989 is about 1410.3454695625.

The spelling of 2805281989 in words is "two billion, eight hundred five million, two hundred eighty-one thousand, nine hundred eighty-nine".