8003820581 has 2 divisors, whose sum is σ = 8003820582. Its totient is φ = 8003820580.

The previous prime is 8003820533. The next prime is 8003820611. The reversal of 8003820581 is 1850283008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7606456225 + 397364356 = 87215^2 + 19934^2 .

It is a cyclic number.

It is not a de Polignac number, because 8003820581 - 2¹⁴ = 8003804197 is a prime.

It is a super-2 number, since 2×8003820581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8003850581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4001910290 + 4001910291.

It is an arithmetic number, because the mean of its divisors is an integer number (4001910291).

Almost surely, 2^8003820581 is an apocalyptic number.

It is an amenable number.

8003820581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8003820581 is an equidigital number, since it uses as much as digits as its factorization.

8003820581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 8003820581 is about 89464.0742477113. The cubic root of 8003820581 is about 2000.3183310800.

The spelling of 8003820581 in words is "eight billion, three million, eight hundred twenty thousand, five hundred eighty-one".