806816501 has 4 divisors (see below), whose sum is σ = 808133292. Its totient is φ = 805499712.

The previous prime is 806816477. The next prime is 806816519. The reversal of 806816501 is 105618608.

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 256960900 + 549855601 = 16030^2 + 23449^2 .

It is a cyclic number.

It is not a de Polignac number, because 806816501 - 2¹⁴ = 806800117 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 (806816401) 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, 657476 + ... + 658701.

It is an arithmetic number, because the mean of its divisors is an integer number (202033323).

Almost surely, 2^806816501 is an apocalyptic number.

It is an amenable number.

806816501 is a deficient number, since it is larger than the sum of its proper divisors (1316791).

806816501 is a wasteful number, since it uses less digits than its factorization.

806816501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316790.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 806816501 is about 28404.5155037012. The cubic root of 806816501 is about 930.9469296741.

The spelling of 806816501 in words is "eight hundred six million, eight hundred sixteen thousand, five hundred one".