51208225 has 6 divisors (see below), whose sum is σ = 63498230. Its totient is φ = 40966560.

The previous prime is 51208207. The next prime is 51208231. The reversal of 51208225 is 52280215.

It can be written as a sum of positive squares in 3 ways, for example, as 57121 + 51151104 = 239^2 + 7152^2 .

It is not a de Polignac number, because 51208225 - 2¹⁷ = 51077153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 2048329 = 51208225 / (5 + 1 + 2 + 0 + 8 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 51208225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1024140 + ... + 1024189.

Almost surely, 2^51208225 is an apocalyptic number.

It is an amenable number.

51208225 is a deficient number, since it is larger than the sum of its proper divisors (12290005).

51208225 is a wasteful number, since it uses less digits than its factorization.

51208225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048339 (or 2048334 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 51208225 is about 7155.9922442663. The cubic root of 51208225 is about 371.3469895140.

The spelling of 51208225 in words is "fifty-one million, two hundred eight thousand, two hundred twenty-five".