521545125 has 64 divisors (see below), whose sum is σ = 959122944. Its totient is φ = 250342400.

The previous prime is 521545111. The next prime is 521545139.

521545125 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (521545111) and next prime (521545139).

It is not a de Polignac number, because 521545125 - 2⁵ = 521545093 is a prime.

It is a super-2 number, since 2×521545125² = 544018634822531250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521545092 and 521545101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 144847 + ... + 148403.

It is an arithmetic number, because the mean of its divisors is an integer number (14986296).

Almost surely, 2^521545125 is an apocalyptic number.

It is an amenable number.

521545125 is a deficient number, since it is larger than the sum of its proper divisors (437577819).

521545125 is a wasteful number, since it uses less digits than its factorization.

521545125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615 (or 3605 counting only the distinct ones).

The product of its digits is 10000, while the sum is 30.

The square root of 521545125 is about 22837.3624790605. The cubic root of 521545125 is about 804.9408415562.

Adding to 521545125 its product of digits (10000), we get a palindrome (521555125).

Subtracting from 521545125 its product of digits (10000), we obtain a palindrome (521535125).

The spelling of 521545125 in words is "five hundred twenty-one million, five hundred forty-five thousand, one hundred twenty-five".