808861 has 4 divisors (see below), whose sum is σ = 811072.
Its totient is φ = 806652.
The previous prime is 808853. The next prime is 808867. The reversal of 808861 is 168808.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 808861 - 23 = 808853 is a prime.
It is a super-2 number, since 2×8088612 = 1308512234642, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (808867) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411 + ... + 1336.
It is an arithmetic number, because the mean of its divisors is an integer number (202768).
It is a 366-hyperperfect number.
2808861 is an apocalyptic number.
It is an amenable number.
808861 is a deficient number, since it is larger than the sum of its proper divisors (2211).
808861 is a wasteful number, since it uses less digits than its factorization.
808861 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2210.
The product of its (nonzero) digits is 3072, while the sum is 31.
The square root of 808861 is about 899.3669996170.
The cubic root of 808861 is about 93.1732616230.
The spelling of 808861 in words is "eight hundred eight thousand, eight hundred sixty-one".