533661 has 4 divisors (see below), whose sum is σ = 711552. Its totient is φ = 355772.

The previous prime is 533641. The next prime is 533671. The reversal of 533661 is 166335.

533661 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 533661 - 2⁹ = 533149 is a prime.

It is a D-number.

533661 is strictly pandigital in base 7.

533661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (533641) 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, 88941 + ... + 88946.

It is an arithmetic number, because the mean of its divisors is an integer number (177888).

2⁵³³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

533661 is a deficient number, since it is larger than the sum of its proper divisors (177891).

533661 is a wasteful number, since it uses less digits than its factorization.

533661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177890.

The product of its digits is 1620, while the sum is 24.

The square root of 533661 is about 730.5210469247. The cubic root of 533661 is about 81.1126309981.

Adding to 533661 its reverse (166335), we get a palindrome (699996).

The spelling of 533661 in words is "five hundred thirty-three thousand, six hundred sixty-one".