51255625 has 10 divisors (see below), whose sum is σ = 64049810. Its totient is φ = 41004000.

The previous prime is 51255623. The next prime is 51255637. The reversal of 51255625 is 52655215.

It can be written as a sum of positive squares in 5 ways, for example, as 7112889 + 44142736 = 2667^2 + 6644^2 .

It is not a de Polignac number, because 51255625 - 2¹ = 51255623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51255623) 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 9 ways as a sum of consecutive naturals, for example, 40380 + ... + 41629.

It is an arithmetic number, because the mean of its divisors is an integer number (6404981).

Almost surely, 2^51255625 is an apocalyptic number.

It is an amenable number.

51255625 is a deficient number, since it is larger than the sum of its proper divisors (12794185).

51255625 is an frugal number, since it uses more digits than its factorization.

51255625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82029 (or 82014 counting only the distinct ones).

The product of its digits is 15000, while the sum is 31.

The square root of 51255625 is about 7159.3033879003. The cubic root of 51255625 is about 371.4615311340.

The spelling of 51255625 in words is "fifty-one million, two hundred fifty-five thousand, six hundred twenty-five".