8118406591 has 2 divisors, whose sum is σ = 8118406592. Its totient is φ = 8118406590.

The previous prime is 8118406519. The next prime is 8118406609. The reversal of 8118406591 is 1956048118.

Together with previous prime (8118406519) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8118406591 - 2¹⁷ = 8118275519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8118406501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4059203295 + 4059203296.

It is an arithmetic number, because the mean of its divisors is an integer number (4059203296).

Almost surely, 2^8118406591 is an apocalyptic number.

8118406591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8118406591 is an equidigital number, since it uses as much as digits as its factorization.

8118406591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 8118406591 is about 90102.2008110790. The cubic root of 8118406591 is about 2009.8189313224.

The spelling of 8118406591 in words is "eight billion, one hundred eighteen million, four hundred six thousand, five hundred ninety-one".