806545 has 4 divisors (see below), whose sum is σ = 967860. Its totient is φ = 645232.

The previous prime is 806543. The next prime is 806549. The reversal of 806545 is 545608.

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 253009 + 553536 = 503^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 806545 - 2¹ = 806543 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (806543) 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, 80650 + ... + 80659.

It is an arithmetic number, because the mean of its divisors is an integer number (241965).

2⁸⁰⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

806545 is a deficient number, since it is larger than the sum of its proper divisors (161315).

806545 is a wasteful number, since it uses less digits than its factorization.

806545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161314.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 806545 is about 898.0785043636. The cubic root of 806545 is about 93.0842493957.

The spelling of 806545 in words is "eight hundred six thousand, five hundred forty-five".