51210225 has 120 divisors (see below), whose sum is σ = 109829280. Its totient is φ = 23522400.

The previous prime is 51210217. The next prime is 51210227. The reversal of 51210225 is 52201215.

It is not a de Polignac number, because 51210225 - 2³ = 51210217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51210198 and 51210207.

It is not an unprimeable number, because it can be changed into a prime (51210227) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2695266 + ... + 2695284.

It is an arithmetic number, because the mean of its divisors is an integer number (915244).

Almost surely, 2^51210225 is an apocalyptic number.

51210225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51210225 is an abundant number, since it is smaller than the sum of its proper divisors (58619055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51210225 is a wasteful number, since it uses less digits than its factorization.

51210225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51210225 is about 7156.1319859265. The cubic root of 51210225 is about 371.3518239217.

It can be divided in two parts, 51 and 210225, that added together give a triangular number (210276 = T₆₄₈).

The spelling of 51210225 in words is "fifty-one million, two hundred ten thousand, two hundred twenty-five".