51530725 has 12 divisors (see below), whose sum is σ = 64184260. Its totient is φ = 41040000.

The previous prime is 51530719. The next prime is 51530729. The reversal of 51530725 is 52703515.

51530725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 164836 + 51365889 = 406^2 + 7167^2 .

It is not a de Polignac number, because 51530725 - 2⁵ = 51530693 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51530693 and 51530702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1225 + ... + 10225.

Almost surely, 2^51530725 is an apocalyptic number.

It is an amenable number.

51530725 is a deficient number, since it is larger than the sum of its proper divisors (12653535).

51530725 is a wasteful number, since it uses less digits than its factorization.

51530725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240 (or 9235 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 51530725 is about 7178.4904401970. The cubic root of 51530725 is about 372.1249170995.

The spelling of 51530725 in words is "fifty-one million, five hundred thirty thousand, seven hundred twenty-five".