533991 has 16 divisors (see below), whose sum is σ = 760320. Its totient is φ = 332640.

The previous prime is 533989. The next prime is 533993. The reversal of 533991 is 199335.

533991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (533989) and next prime (533993).

It is not a de Polignac number, because 533991 - 2¹ = 533989 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (533993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4845 + ... + 4953.

It is an arithmetic number, because the mean of its divisors is an integer number (47520).

2⁵³³⁹⁹¹ is an apocalyptic number.

533991 is a deficient number, since it is larger than the sum of its proper divisors (226329).

533991 is a wasteful number, since it uses less digits than its factorization.

533991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its digits is 3645, while the sum is 30.

The square root of 533991 is about 730.7468782007. The cubic root of 533991 is about 81.1293467614.

The spelling of 533991 in words is "five hundred thirty-three thousand, nine hundred ninety-one".