9909999098 has 16 divisors (see below), whose sum is σ = 15656276160. Its totient is φ = 4695267456.

The previous prime is 9909999067. The next prime is 9909999109. The reversal of 9909999098 is 8909999099.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001783 + ... + 1011626.

It is an arithmetic number, because the mean of its divisors is an integer number (978517260).

Almost surely, 2^9909999098 is an apocalyptic number.

9909999098 is a deficient number, since it is larger than the sum of its proper divisors (5746277062).

9909999098 is a wasteful number, since it uses less digits than its factorization.

9909999098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013541.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The square root of 9909999098 is about 99548.9783875254. The cubic root of 9909999098 is about 2147.9518333462.

Subtracting from 9909999098 its reverse (8909999099), we obtain a palindrome (999999999).

The spelling of 9909999098 in words is "nine billion, nine hundred nine million, nine hundred ninety-nine thousand, ninety-eight".