806695891 has 4 divisors (see below), whose sum is σ = 810790992. Its totient is φ = 802600792.

The previous prime is 806695889. The next prime is 806695913. The reversal of 806695891 is 198596608.

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

It is a cyclic number.

It is not a de Polignac number, because 806695891 - 2¹ = 806695889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806695801) 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, 2047255 + ... + 2047648.

It is an arithmetic number, because the mean of its divisors is an integer number (202697748).

Almost surely, 2^806695891 is an apocalyptic number.

806695891 is a deficient number, since it is larger than the sum of its proper divisors (4095101).

806695891 is a wasteful number, since it uses less digits than its factorization.

806695891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095100.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 806695891 is about 28402.3923464204. The cubic root of 806695891 is about 930.9005386610.

The spelling of 806695891 in words is "eight hundred six million, six hundred ninety-five thousand, eight hundred ninety-one".