51247225 has 12 divisors (see below), whose sum is σ = 63635436. Its totient is φ = 40940480.

The previous prime is 51247219. The next prime is 51247267. The reversal of 51247225 is 52274215.

It can be written as a sum of positive squares in 6 ways, for example, as 8042896 + 43204329 = 2836^2 + 6573^2 .

It is not a de Polignac number, because 51247225 - 2²⁵ = 17692793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51247193 and 51247202.

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, 33579 + ... + 35071.

It is an arithmetic number, because the mean of its divisors is an integer number (5302953).

Almost surely, 2^51247225 is an apocalyptic number.

It is an amenable number.

51247225 is a deficient number, since it is larger than the sum of its proper divisors (12388211).

51247225 is a wasteful number, since it uses less digits than its factorization.

51247225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876 (or 2871 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 51247225 is about 7158.7167146074. The cubic root of 51247225 is about 371.4412377690.

The spelling of 51247225 in words is "fifty-one million, two hundred forty-seven thousand, two hundred twenty-five".