8020997531 has 2 divisors, whose sum is σ = 8020997532. Its totient is φ = 8020997530.

The previous prime is 8020997521. The next prime is 8020997591. The reversal of 8020997531 is 1357990208.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8020997531 - 2²² = 8016803227 is a prime.

It is a super-2 number, since 2×8020997531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8020997521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010498765 + 4010498766.

It is an arithmetic number, because the mean of its divisors is an integer number (4010498766).

Almost surely, 2^8020997531 is an apocalyptic number.

8020997531 is a deficient number, since it is larger than the sum of its proper divisors (1).

8020997531 is an equidigital number, since it uses as much as digits as its factorization.

8020997531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 8020997531 is about 89560.0219461786. The cubic root of 8020997531 is about 2001.7482655884.

The spelling of 8020997531 in words is "eight billion, twenty million, nine hundred ninety-seven thousand, five hundred thirty-one".