9919890189 has 12 divisors (see below), whose sum is σ = 15631342272. Its totient is φ = 6012054600.

The previous prime is 9919890157. The next prime is 9919890251. The reversal of 9919890189 is 9810989199.

It is not a de Polignac number, because 9919890189 - 2⁵ = 9919890157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919890119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50100357 + ... + 50100554.

It is an arithmetic number, because the mean of its divisors is an integer number (1302611856).

Almost surely, 2^9919890189 is an apocalyptic number.

9919890189 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

9919890189 is a deficient number, since it is larger than the sum of its proper divisors (5711452083).

9919890189 is a wasteful number, since it uses less digits than its factorization.

9919890189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100200928 (or 100200925 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 63.

The square root of 9919890189 is about 99598.6455178985. The cubic root of 9919890189 is about 2148.6662135866. Note that the first 3 decimals are identical.

The spelling of 9919890189 in words is "nine billion, nine hundred nineteen million, eight hundred ninety thousand, one hundred eighty-nine".