806621871 has 16 divisors (see below), whose sum is σ = 1173742848. Its totient is φ = 488664000.

The previous prime is 806621869. The next prime is 806621873. The reversal of 806621871 is 178126608.

It is an interprime number because it is at equal distance from previous prime (806621869) and next prime (806621873).

It is not a de Polignac number, because 806621871 - 2¹ = 806621869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806621873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160446 + ... + 165396.

It is an arithmetic number, because the mean of its divisors is an integer number (73358928).

Almost surely, 2^806621871 is an apocalyptic number.

806621871 is a deficient number, since it is larger than the sum of its proper divisors (367120977).

806621871 is a wasteful number, since it uses less digits than its factorization.

806621871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9902.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 806621871 is about 28401.0892572803. The cubic root of 806621871 is about 930.8720655746.

The spelling of 806621871 in words is "eight hundred six million, six hundred twenty-one thousand, eight hundred seventy-one".