8440220491 has 2 divisors, whose sum is σ = 8440220492. Its totient is φ = 8440220490.

The previous prime is 8440220447. The next prime is 8440220497. The reversal of 8440220491 is 1940220448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8440220491 - 2²¹ = 8438123339 is a prime.

It is not a weakly prime, because it can be changed into another prime (8440220497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4220110245 + 4220110246.

It is an arithmetic number, because the mean of its divisors is an integer number (4220110246).

Almost surely, 2^8440220491 is an apocalyptic number.

8440220491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8440220491 is an equidigital number, since it uses as much as digits as its factorization.

8440220491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 8440220491 is about 91870.6726382255. The cubic root of 8440220491 is about 2036.0319903773.

The spelling of 8440220491 in words is "eight billion, four hundred forty million, two hundred twenty thousand, four hundred ninety-one".