806556213 has 24 divisors (see below), whose sum is σ = 1246462880. Its totient is φ = 501046560.

The previous prime is 806556209. The next prime is 806556217. The reversal of 806556213 is 312655608.

806556213 is a `hidden beast` number, since 80 + 6 + 5 + 562 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (806556209) and next prime (806556217).

It is not a de Polignac number, because 806556213 - 2² = 806556209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806556217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28231 + ... + 49092.

Almost surely, 2^806556213 is an apocalyptic number.

It is an amenable number.

806556213 is a deficient number, since it is larger than the sum of its proper divisors (439906667).

806556213 is a wasteful number, since it uses less digits than its factorization.

806556213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77409 (or 77406 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 806556213 is about 28399.9333273865. The cubic root of 806556213 is about 930.8468076197.

It can be divided in two parts, 80655 and 6213, that added together give a palindrome (86868).

The spelling of 806556213 in words is "eight hundred six million, five hundred fifty-six thousand, two hundred thirteen".