535721 has 4 divisors (see below), whose sum is σ = 567252. Its totient is φ = 504192.

The previous prime is 535709. The next prime is 535727. The reversal of 535721 is 127535.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 384400 = 389^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 535721 - 2¹⁰ = 534697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 535721.

It is not an unprimeable number, because it can be changed into a prime (535727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15740 + ... + 15773.

It is an arithmetic number, because the mean of its divisors is an integer number (141813).

2⁵³⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

535721 is a deficient number, since it is larger than the sum of its proper divisors (31531).

535721 is a wasteful number, since it uses less digits than its factorization.

535721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31530.

The product of its digits is 1050, while the sum is 23.

The square root of 535721 is about 731.9296414274. The cubic root of 535721 is about 81.2168653847.

The spelling of 535721 in words is "five hundred thirty-five thousand, seven hundred twenty-one".