535991 has 2 divisors, whose sum is σ = 535992. Its totient is φ = 535990.

The previous prime is 535973. The next prime is 535999. The reversal of 535991 is 199535.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-535991 is a prime.

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 535991.

It is not a weakly prime, because it can be changed into another prime (535999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267995 + 267996.

It is an arithmetic number, because the mean of its divisors is an integer number (267996).

2⁵³⁵⁹⁹¹ is an apocalyptic number.

535991 is a deficient number, since it is larger than the sum of its proper divisors (1).

535991 is an equidigital number, since it uses as much as digits as its factorization.

535991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6075, while the sum is 32.

The square root of 535991 is about 732.1140621515. The cubic root of 535991 is about 81.2305073555.

The spelling of 535991 in words is "five hundred thirty-five thousand, nine hundred ninety-one".