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806681 = 7691049
BaseRepresentation
bin11000100111100011001
31111222120002
43010330121
5201303211
625142345
76566561
oct3047431
91458502
10806681
11501087
1232a9b5
13223235
1416dda1
1510e03b
hexc4f19

806681 has 4 divisors (see below), whose sum is σ = 808500. Its totient is φ = 804864.

The previous prime is 806671. The next prime is 806719. The reversal of 806681 is 186608.

806681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 259081 = 740^2 + 509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-806681 is a prime.

It is a super-2 number, since 2×8066812 = 1301468471522, which contains 22 as substring.

It is a magnanimous number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 806681.

It is not an unprimeable number, because it can be changed into a prime (806671) 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, 245 + ... + 1293.

It is an arithmetic number, because the mean of its divisors is an integer number (202125).

2806681 is an apocalyptic number.

It is an amenable number.

806681 is a deficient number, since it is larger than the sum of its proper divisors (1819).

806681 is a wasteful number, since it uses less digits than its factorization.

806681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 806681 is about 898.1542183835. The cubic root of 806681 is about 93.0894810718.

The spelling of 806681 in words is "eight hundred six thousand, six hundred eighty-one".

Divisors: 1 769 1049 806681