521520125 has 64 divisors (see below), whose sum is σ = 774918144. Its totient is φ = 343022400.

The previous prime is 521520107. The next prime is 521520127. The reversal of 521520125 is 521025125.

It is not a de Polignac number, because 521520125 - 2¹⁸ = 521257981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521520125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521520127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3122792 + ... + 3122958.

It is an arithmetic number, because the mean of its divisors is an integer number (12108096).

Almost surely, 2^521520125 is an apocalyptic number.

It is an amenable number.

521520125 is a deficient number, since it is larger than the sum of its proper divisors (253398019).

521520125 is a wasteful number, since it uses less digits than its factorization.

521520125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 521520125 is about 22836.8151238302. The cubic root of 521520125 is about 804.9279798742.

The spelling of 521520125 in words is "five hundred twenty-one million, five hundred twenty thousand, one hundred twenty-five".