9820004581 has 2 divisors, whose sum is σ = 9820004582. Its totient is φ = 9820004580.

The previous prime is 9820004561. The next prime is 9820004731. The reversal of 9820004581 is 1854000289.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9802782081 + 17222500 = 99009^2 + 4150^2 .

It is a cyclic number.

It is not a de Polignac number, because 9820004581 - 2¹⁵ = 9819971813 is a prime.

It is a super-2 number, since 2×9820004581² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9820004581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9820004531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910002290 + 4910002291.

It is an arithmetic number, because the mean of its divisors is an integer number (4910002291).

Almost surely, 2^9820004581 is an apocalyptic number.

It is an amenable number.

9820004581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9820004581 is an equidigital number, since it uses as much as digits as its factorization.

9820004581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 9820004581 is about 99095.9362486676. The cubic root of 9820004581 is about 2141.4300702047.

The spelling of 9820004581 in words is "nine billion, eight hundred twenty million, four thousand, five hundred eighty-one".