51805525 has 12 divisors (see below), whose sum is σ = 64526500. Its totient is φ = 41258880.

The previous prime is 51805519. The next prime is 51805541. The reversal of 51805525 is 52550815.

It can be written as a sum of positive squares in 6 ways, for example, as 4498641 + 47306884 = 2121^2 + 6878^2 .

It is not a de Polignac number, because 51805525 - 2³ = 51805517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1201 + ... + 10249.

Almost surely, 2^51805525 is an apocalyptic number.

It is an amenable number.

51805525 is a deficient number, since it is larger than the sum of its proper divisors (12720975).

51805525 is a wasteful number, since it uses less digits than its factorization.

51805525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9288 (or 9283 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 51805525 is about 7197.6055046105. The cubic root of 51805525 is about 372.7852266437.

The spelling of 51805525 in words is "fifty-one million, eight hundred five thousand, five hundred twenty-five".