811601 has 12 divisors (see below), whose sum is σ = 981696. Its totient is φ = 656040.

The previous prime is 811583. The next prime is 811607. The reversal of 811601 is 106118.

It is a happy number.

It is not a de Polignac number, because 811601 - 2¹⁴ = 795217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 811601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11396 + ... + 11466.

It is an arithmetic number, because the mean of its divisors is an integer number (81808).

2⁸¹¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

811601 is a deficient number, since it is larger than the sum of its proper divisors (170095).

811601 is an equidigital number, since it uses as much as digits as its factorization.

811601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 811601 is about 900.8890053719. The cubic root of 811601 is about 93.2783505524.

Adding to 811601 its reverse (106118), we get a palindrome (917719).

The spelling of 811601 in words is "eight hundred eleven thousand, six hundred one".