802591 has 4 divisors (see below), whose sum is σ = 804384. Its totient is φ = 800800.

The previous prime is 802589. The next prime is 802597. The reversal of 802591 is 195208.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 802591 - 2¹ = 802589 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (201096).

2⁸⁰²⁵⁹¹ is an apocalyptic number.

802591 is a deficient number, since it is larger than the sum of its proper divisors (1793).

802591 is an equidigital number, since it uses as much as digits as its factorization.

802591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 802591 is about 895.8744331657. The cubic root of 802591 is about 92.9318883100.

Adding to 802591 its reverse (195208), we get a palindrome (997799).

The spelling of 802591 in words is "eight hundred two thousand, five hundred ninety-one".