525721 has 6 divisors (see below), whose sum is σ = 611610. Its totient is φ = 450576.

The previous prime is 525719. The next prime is 525727. The reversal of 525721 is 127525.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 35721 = 700^2 + 189^2 .

It is not a de Polignac number, because 525721 - 2¹ = 525719 is a prime.

It is a Duffinian number.

525721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 525692 and 525701.

It is not an unprimeable number, because it can be changed into a prime (525727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5316 + ... + 5413.

It is an arithmetic number, because the mean of its divisors is an integer number (101935).

2⁵²⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

525721 is a deficient number, since it is larger than the sum of its proper divisors (85889).

525721 is a wasteful number, since it uses less digits than its factorization.

525721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10743 (or 10736 counting only the distinct ones).

The product of its digits is 700, while the sum is 22.

The square root of 525721 is about 725.0662038738. The cubic root of 525721 is about 80.7083449976.

The spelling of 525721 in words is "five hundred twenty-five thousand, seven hundred twenty-one".