2808131 has 4 divisors (see below), whose sum is σ = 2876664. Its totient is φ = 2739600.

The previous prime is 2808119. The next prime is 2808149. The reversal of 2808131 is 1318082.

2808131 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2808131 is a prime.

It is a super-2 number, since 2×2808131² = 15771199426322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 2808097 and 2808106.

It is not an unprimeable number, because it can be changed into a prime (2808101) 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, 34205 + ... + 34286.

It is an arithmetic number, because the mean of its divisors is an integer number (719166).

2^2808131 is an apocalyptic number.

2808131 is a deficient number, since it is larger than the sum of its proper divisors (68533).

2808131 is an equidigital number, since it uses as much as digits as its factorization.

2808131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68532.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2808131 is about 1675.7478927333. The cubic root of 2808131 is about 141.0822751383.

The spelling of 2808131 in words is "two million, eight hundred eight thousand, one hundred thirty-one".