51808825 has 24 divisors (see below), whose sum is σ = 66631896. Its totient is φ = 39936000.

The previous prime is 51808817. The next prime is 51808853. The reversal of 51808825 is 52880815.

It can be written as a sum of positive squares in 12 ways, for example, as 11397376 + 40411449 = 3376^2 + 6357^2 .

It is not a de Polignac number, because 51808825 - 2³ = 51808817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80505 + ... + 81145.

It is an arithmetic number, because the mean of its divisors is an integer number (2776329).

Almost surely, 2^51808825 is an apocalyptic number.

It is an amenable number.

51808825 is a deficient number, since it is larger than the sum of its proper divisors (14823071).

51808825 is a wasteful number, since it uses less digits than its factorization.

51808825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 51808825 is about 7197.8347438657. The cubic root of 51808825 is about 372.7931419200.

The spelling of 51808825 in words is "fifty-one million, eight hundred eight thousand, eight hundred twenty-five".