806685631 has 2 divisors, whose sum is σ = 806685632. Its totient is φ = 806685630.

The previous prime is 806685629. The next prime is 806685653. The reversal of 806685631 is 136586608.

806685631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 806685631 - 2¹ = 806685629 is a prime.

It is a super-2 number, since 2×806685631² = 1301483414523736322, which contains 22 as substring.

Together with 806685629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806685731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403342815 + 403342816.

It is an arithmetic number, because the mean of its divisors is an integer number (403342816).

Almost surely, 2^806685631 is an apocalyptic number.

806685631 is a deficient number, since it is larger than the sum of its proper divisors (1).

806685631 is an equidigital number, since it uses as much as digits as its factorization.

806685631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 806685631 is about 28402.2117272581. The cubic root of 806685631 is about 930.8965920767.

The spelling of 806685631 in words is "eight hundred six million, six hundred eighty-five thousand, six hundred thirty-one".