797581 has 2 divisors, whose sum is σ = 797582. Its totient is φ = 797580.

The previous prime is 797579. The next prime is 797591. The reversal of 797581 is 185797.

797581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443556 + 354025 = 666^2 + 595^2 .

It is an emirp because it is prime and its reverse (185797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 797581 - 2¹ = 797579 is a prime.

It is a super-2 number, since 2×797581² = 1272270903122, which contains 22 as substring.

Together with 797579, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 797581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398790 + 398791.

It is an arithmetic number, because the mean of its divisors is an integer number (398791).

2⁷⁹⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

797581 is a deficient number, since it is larger than the sum of its proper divisors (1).

797581 is an equidigital number, since it uses as much as digits as its factorization.

797581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 797581 is about 893.0739051165. The cubic root of 797581 is about 92.7381155112.

It can be divided in two parts, 797 and 581, that added together give a triangular number (1378 = T₅₂).

The spelling of 797581 in words is "seven hundred ninety-seven thousand, five hundred eighty-one".