808931 has 4 divisors (see below), whose sum is σ = 830832. Its totient is φ = 787032.

The previous prime is 808919. The next prime is 808937. The reversal of 808931 is 139808.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 808931 - 2⁶ = 808867 is a prime.

It is a super-2 number, since 2×808931² = 1308738725522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 808894 and 808903.

It is not an unprimeable number, because it can be changed into a prime (808937) 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, 10895 + ... + 10968.

It is an arithmetic number, because the mean of its divisors is an integer number (207708).

2⁸⁰⁸⁹³¹ is an apocalyptic number.

808931 is a deficient number, since it is larger than the sum of its proper divisors (21901).

808931 is a wasteful number, since it uses less digits than its factorization.

808931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21900.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 808931 is about 899.4059150350. The cubic root of 808931 is about 93.1759493284.

The spelling of 808931 in words is "eight hundred eight thousand, nine hundred thirty-one".