2808961 has 4 divisors (see below), whose sum is σ = 2974212. Its totient is φ = 2643712.

The previous prime is 2808959. The next prime is 2808977. The reversal of 2808961 is 1698082.

2808961 is nontrivially palindromic in base 11.

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 1838736 + 970225 = 1356^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2808961 - 2¹ = 2808959 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2808901) 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, 82600 + ... + 82633.

It is an arithmetic number, because the mean of its divisors is an integer number (743553).

2^2808961 is an apocalyptic number.

It is an amenable number.

2808961 is a deficient number, since it is larger than the sum of its proper divisors (165251).

2808961 is a wasteful number, since it uses less digits than its factorization.

2808961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165250.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2808961 is about 1675.9955250537. The cubic root of 2808961 is about 141.0961736771.

The spelling of 2808961 in words is "two million, eight hundred eight thousand, nine hundred sixty-one".