51504225 has 12 divisors (see below), whose sum is σ = 85153776. Its totient is φ = 27468880.

The previous prime is 51504221. The next prime is 51504247. The reversal of 51504225 is 52240515.

It is a happy number.

It is not a de Polignac number, because 51504225 - 2² = 51504221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51504195 and 51504204.

It is not an unprimeable number, because it can be changed into a prime (51504221) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 343287 + ... + 343436.

It is an arithmetic number, because the mean of its divisors is an integer number (7096148).

Almost surely, 2^51504225 is an apocalyptic number.

It is an amenable number.

51504225 is a deficient number, since it is larger than the sum of its proper divisors (33649551).

51504225 is a wasteful number, since it uses less digits than its factorization.

51504225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686736 (or 686731 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51504225 is about 7176.6444108650. The cubic root of 51504225 is about 372.0611169673.

The spelling of 51504225 in words is "fifty-one million, five hundred four thousand, two hundred twenty-five".