521217125 has 48 divisors (see below), whose sum is σ = 768740544. Its totient is φ = 349752000.

The previous prime is 521217121. The next prime is 521217143. The reversal of 521217125 is 521712125.

It is not a de Polignac number, because 521217125 - 2² = 521217121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521217094 and 521217103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521217121) 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 47 ways as a sum of consecutive naturals, for example, 231254 + ... + 233496.

It is an arithmetic number, because the mean of its divisors is an integer number (16015428).

Almost surely, 2^521217125 is an apocalyptic number.

521217125 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521217125 is a deficient number, since it is larger than the sum of its proper divisors (247523419).

521217125 is a wasteful number, since it uses less digits than its factorization.

521217125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295 (or 2272 counting only the distinct ones).

The product of its digits is 1400, while the sum is 26.

The square root of 521217125 is about 22830.1801350756. The cubic root of 521217125 is about 804.7720635986.

The spelling of 521217125 in words is "five hundred twenty-one million, two hundred seventeen thousand, one hundred twenty-five".