806966621 has 4 divisors (see below), whose sum is σ = 820195644. Its totient is φ = 793737600.

The previous prime is 806966609. The next prime is 806966623. The reversal of 806966621 is 126669608.

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 286624900 + 520341721 = 16930^2 + 22811^2 .

It is a cyclic number.

It is not a de Polignac number, because 806966621 - 2²⁶ = 739857757 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 (806966623) 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, 6614420 + ... + 6614541.

It is an arithmetic number, because the mean of its divisors is an integer number (205048911).

Almost surely, 2^806966621 is an apocalyptic number.

It is an amenable number.

806966621 is a deficient number, since it is larger than the sum of its proper divisors (13229023).

806966621 is a wasteful number, since it uses less digits than its factorization.

806966621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13229022.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 806966621 is about 28407.1579183839. The cubic root of 806966621 is about 931.0046648535.

The spelling of 806966621 in words is "eight hundred six million, nine hundred sixty-six thousand, six hundred twenty-one".