9899370581 has 8 divisors (see below), whose sum is σ = 10102800384. Its totient is φ = 9696557520.

The previous prime is 9899370563. The next prime is 9899370601. The reversal of 9899370581 is 1850739989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9899370581 is a prime.

It is a super-2 number, since 2×9899370581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9899370581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899370511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121685 + ... + 186026.

It is an arithmetic number, because the mean of its divisors is an integer number (1262850048).

Almost surely, 2^9899370581 is an apocalyptic number.

It is an amenable number.

9899370581 is a deficient number, since it is larger than the sum of its proper divisors (203429803).

9899370581 is a wasteful number, since it uses less digits than its factorization.

9899370581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308371.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The square root of 9899370581 is about 99495.5807109039. The cubic root of 9899370581 is about 2147.1836627738.

The spelling of 9899370581 in words is "nine billion, eight hundred ninety-nine million, three hundred seventy thousand, five hundred eighty-one".