806127991 has 8 divisors (see below), whose sum is σ = 871490480. Its totient is φ = 743059008.

The previous prime is 806127983. The next prime is 806128007. The reversal of 806127991 is 199721608.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 806127991 - 2³ = 806127983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806127901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572646 + ... + 574051.

It is an arithmetic number, because the mean of its divisors is an integer number (108936310).

Almost surely, 2^806127991 is an apocalyptic number.

806127991 is a deficient number, since it is larger than the sum of its proper divisors (65362489).

806127991 is a wasteful number, since it uses less digits than its factorization.

806127991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146753.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 806127991 is about 28392.3931890216. The cubic root of 806127991 is about 930.6820414033.

The spelling of 806127991 in words is "eight hundred six million, one hundred twenty-seven thousand, nine hundred ninety-one".