51565625 has 24 divisors (see below), whose sum is σ = 66792600. Its totient is φ = 39760000.

The previous prime is 51565597. The next prime is 51565649. The reversal of 51565625 is 52656515.

It can be written as a sum of positive squares in 12 ways, for example, as 50651689 + 913936 = 7117^2 + 956^2 .

It is not a de Polignac number, because 51565625 - 2¹² = 51561529 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90341 + ... + 90909.

It is an arithmetic number, because the mean of its divisors is an integer number (2783025).

Almost surely, 2^51565625 is an apocalyptic number.

It is an amenable number.

51565625 is a deficient number, since it is larger than the sum of its proper divisors (15226975).

51565625 is an frugal number, since it uses more digits than its factorization.

51565625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 603 counting only the distinct ones).

The product of its digits is 45000, while the sum is 35.

The square root of 51565625 is about 7180.9209019457. The cubic root of 51565625 is about 372.2089073065.

The spelling of 51565625 in words is "fifty-one million, five hundred sixty-five thousand, six hundred twenty-five".