521616525 has 48 divisors (see below), whose sum is σ = 916012800. Its totient is φ = 261007360.

The previous prime is 521616523. The next prime is 521616527. The reversal of 521616525 is 525616125.

It is an interprime number because it is at equal distance from previous prime (521616523) and next prime (521616527).

It is not a de Polignac number, because 521616525 - 2¹ = 521616523 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521616521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 725116 + ... + 725834.

It is an arithmetic number, because the mean of its divisors is an integer number (19083600).

Almost surely, 2^521616525 is an apocalyptic number.

It is an amenable number.

521616525 is a deficient number, since it is larger than the sum of its proper divisors (394396275).

521616525 is a wasteful number, since it uses less digits than its factorization.

521616525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1313 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 521616525 is about 22838.9256533664. The cubic root of 521616525 is about 804.9775722569.

The spelling of 521616525 in words is "five hundred twenty-one million, six hundred sixteen thousand, five hundred twenty-five".