51515125 has 16 divisors (see below), whose sum is σ = 64576512. Its totient is φ = 41029200.

The previous prime is 51515081. The next prime is 51515129. The reversal of 51515125 is 52151515.

51515125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51515125 - 2¹³ = 51506933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51515125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515129) 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 15 ways as a sum of consecutive naturals, for example, 32092 + ... + 33658.

It is an arithmetic number, because the mean of its divisors is an integer number (4036032).

Almost surely, 2^51515125 is an apocalyptic number.

It is an amenable number.

51515125 is a deficient number, since it is larger than the sum of its proper divisors (13061387).

51515125 is a wasteful number, since it uses less digits than its factorization.

51515125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1835 counting only the distinct ones).

The product of its digits is 1250, while the sum is 25.

The square root of 51515125 is about 7177.4037785260. The cubic root of 51515125 is about 372.0873619347.

The spelling of 51515125 in words is "fifty-one million, five hundred fifteen thousand, one hundred twenty-five".