51365225 has 6 divisors (see below), whose sum is σ = 63692910. Its totient is φ = 41092160.

The previous prime is 51365221. The next prime is 51365261. The reversal of 51365225 is 52256315.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6031936 + 45333289 = 2456^2 + 6733^2 .

It is not a de Polignac number, because 51365225 - 2² = 51365221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51365221) 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, 1027280 + ... + 1027329.

It is an arithmetic number, because the mean of its divisors is an integer number (10615485).

Almost surely, 2^51365225 is an apocalyptic number.

It is an amenable number.

51365225 is a deficient number, since it is larger than the sum of its proper divisors (12327685).

51365225 is a wasteful number, since it uses less digits than its factorization.

51365225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054619 (or 2054614 counting only the distinct ones).

The product of its digits is 9000, while the sum is 29.

The square root of 51365225 is about 7166.9536764235. The cubic root of 51365225 is about 371.7261082734.

The spelling of 51365225 in words is "fifty-one million, three hundred sixty-five thousand, two hundred twenty-five".