806486861 has 4 divisors (see below), whose sum is σ = 809948412. Its totient is φ = 803025312.

The previous prime is 806486843. The next prime is 806486899. The reversal of 806486861 is 168684608.

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 324684361 + 481802500 = 18019^2 + 21950^2 .

It is a cyclic number.

It is not a de Polignac number, because 806486861 - 2⁶ = 806486797 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 (806486831) 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, 1730426 + ... + 1730891.

It is an arithmetic number, because the mean of its divisors is an integer number (202487103).

Almost surely, 2^806486861 is an apocalyptic number.

It is an amenable number.

806486861 is a deficient number, since it is larger than the sum of its proper divisors (3461551).

806486861 is a wasteful number, since it uses less digits than its factorization.

806486861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461550.

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 806486861 is about 28398.7123123567. The cubic root of 806486861 is about 930.8201271325.

The spelling of 806486861 in words is "eight hundred six million, four hundred eighty-six thousand, eight hundred sixty-one".