99868581 has 24 divisors (see below), whose sum is σ = 146968640. Its totient is φ = 65339136.

The previous prime is 99868567. The next prime is 99868583. The reversal of 99868581 is 18586899.

It is not a de Polignac number, because 99868581 - 2¹⁰ = 99867557 is a prime.

It is a super-2 number, since 2×99868581² = 19947466941907122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99868583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120936 + ... + 121758.

Almost surely, 2^99868581 is an apocalyptic number.

It is an amenable number.

99868581 is a deficient number, since it is larger than the sum of its proper divisors (47100059).

99868581 is a wasteful number, since it uses less digits than its factorization.

99868581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1062 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 99868581 is about 9993.4268897111. The cubic root of 99868581 is about 463.9554632367.

The spelling of 99868581 in words is "ninety-nine million, eight hundred sixty-eight thousand, five hundred eighty-one".