2809868225 has 6 divisors (see below), whose sum is σ = 3484236630. Its totient is φ = 2247894560.

The previous prime is 2809868213. The next prime is 2809868227. The reversal of 2809868225 is 5228689082.

It can be written as a sum of positive squares in 3 ways, for example, as 842857024 + 1967011201 = 29032^2 + 44351^2 .

It is not a de Polignac number, because 2809868225 - 2⁸ = 2809867969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2809868227) 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 5 ways as a sum of consecutive naturals, for example, 56197340 + ... + 56197389.

It is an arithmetic number, because the mean of its divisors is an integer number (580706105).

Almost surely, 2^2809868225 is an apocalyptic number.

2809868225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2809868225 is a deficient number, since it is larger than the sum of its proper divisors (674368405).

2809868225 is a wasteful number, since it uses less digits than its factorization.

2809868225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112394739 (or 112394734 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The square root of 2809868225 is about 53008.1901690673. The cubic root of 2809868225 is about 1411.1136223470.

The spelling of 2809868225 in words is "two billion, eight hundred nine million, eight hundred sixty-eight thousand, two hundred twenty-five".