8020997591 has 2 divisors, whose sum is σ = 8020997592. Its totient is φ = 8020997590.

The previous prime is 8020997531. The next prime is 8020997597. The reversal of 8020997591 is 1957990208.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8020997591 - 2¹⁴ = 8020981207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8020997597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010498795 + 4010498796.

It is an arithmetic number, because the mean of its divisors is an integer number (4010498796).

Almost surely, 2^8020997591 is an apocalyptic number.

8020997591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8020997591 is an equidigital number, since it uses as much as digits as its factorization.

8020997591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 8020997591 is about 89560.0222811495. The cubic root of 8020997591 is about 2001.7482705797.

The spelling of 8020997591 in words is "eight billion, twenty million, nine hundred ninety-seven thousand, five hundred ninety-one".