51550225 has 6 divisors (see below), whose sum is σ = 63922310. Its totient is φ = 41240160.

The previous prime is 51550207. The next prime is 51550229. The reversal of 51550225 is 52205515.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6512704 + 45037521 = 2552^2 + 6711^2 .

It is not a de Polignac number, because 51550225 - 2¹⁵ = 51517457 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: 2062009 = 51550225 / (5 + 1 + 5 + 5 + 0 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 51550225.

It is not an unprimeable number, because it can be changed into a prime (51550229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030980 + ... + 1031029.

Almost surely, 2^51550225 is an apocalyptic number.

It is an amenable number.

51550225 is a deficient number, since it is larger than the sum of its proper divisors (12372085).

51550225 is a wasteful number, since it uses less digits than its factorization.

51550225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062019 (or 2062014 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51550225 is about 7179.8485360069. The cubic root of 51550225 is about 372.1718503984.

The spelling of 51550225 in words is "fifty-one million, five hundred fifty thousand, two hundred twenty-five".