535661 has 8 divisors (see below), whose sum is σ = 623040. Its totient is φ = 451008.

The previous prime is 535637. The next prime is 535663. The reversal of 535661 is 166535.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 535661 - 2¹⁰ = 534637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 535661.

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 535661.

It is not an unprimeable number, because it can be changed into a prime (535663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (77880).

2⁵³⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

535661 is a deficient number, since it is larger than the sum of its proper divisors (87379).

535661 is a wasteful number, since it uses less digits than its factorization.

535661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its digits is 2700, while the sum is 26.

The square root of 535661 is about 731.8886527335. Note that the first 3 decimals coincide. The cubic root of 535661 is about 81.2138332131.

The spelling of 535661 in words is "five hundred thirty-five thousand, six hundred sixty-one".