521787125 has 8 divisors (see below), whose sum is σ = 651190488. Its totient is φ = 417429600.

The previous prime is 521787043. The next prime is 521787127.

521787125 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 18861649 + 502925476 = 4343^2 + 22426^2 .

It is not a de Polignac number, because 521787125 - 2¹⁰ = 521786101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521787127) 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 7 ways as a sum of consecutive naturals, for example, 2087024 + ... + 2087273.

It is an arithmetic number, because the mean of its divisors is an integer number (81398811).

Almost surely, 2^521787125 is an apocalyptic number.

It is an amenable number.

521787125 is a deficient number, since it is larger than the sum of its proper divisors (129403363).

521787125 is an equidigital number, since it uses as much as digits as its factorization.

521787125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174312 (or 4174302 counting only the distinct ones).

The product of its digits is 39200, while the sum is 38.

The square root of 521787125 is about 22842.6601997228. The cubic root of 521787125 is about 805.0653213972.

The spelling of 521787125 in words is "five hundred twenty-one million, seven hundred eighty-seven thousand, one hundred twenty-five".