806651 has 4 divisors (see below), whose sum is σ = 832704. Its totient is φ = 780600.

The previous prime is 806639. The next prime is 806657. The reversal of 806651 is 156608.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806651 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 806651.

It is not an unprimeable number, because it can be changed into a prime (806657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12980 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (208176).

2⁸⁰⁶⁶⁵¹ is an apocalyptic number.

806651 is a deficient number, since it is larger than the sum of its proper divisors (26053).

806651 is a wasteful number, since it uses less digits than its factorization.

806651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26052.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 806651 is about 898.1375173101. The cubic root of 806651 is about 93.0883270761.

The spelling of 806651 in words is "eight hundred six thousand, six hundred fifty-one".