51225808 has 20 divisors (see below), whose sum is σ = 99430020. Its totient is φ = 25566464.

The previous prime is 51225799. The next prime is 51225821. The reversal of 51225808 is 80852215.

It can be written as a sum of positive squares in 2 ways, for example, as 17909824 + 33315984 = 4232^2 + 5772^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51225808.

It is a congruent number.

It is an unprimeable number.

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, 7278 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (4971501).

Almost surely, 2^51225808 is an apocalyptic number.

It is an amenable number.

51225808 is a deficient number, since it is larger than the sum of its proper divisors (48204212).

51225808 is a wasteful number, since it uses less digits than its factorization.

51225808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814 (or 5808 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 51225808 is about 7157.2206896253. The cubic root of 51225808 is about 371.3894868989.

The spelling of 51225808 in words is "fifty-one million, two hundred twenty-five thousand, eight hundred eight".