90000189999 has 6 divisors (see below), whose sum is σ = 130000274456. Its totient is φ = 60000126660.

The previous prime is 90000189971. The next prime is 90000190009. The reversal of 90000189999 is 99998100009.

It is not a de Polignac number, because 90000189999 - 2¹³ = 90000181807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90000189949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5000010547 + ... + 5000010564.

Almost surely, 2^90000189999 is an apocalyptic number.

90000189999 is a deficient number, since it is larger than the sum of its proper divisors (40000084457).

90000189999 is a wasteful number, since it uses less digits than its factorization.

90000189999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000021117 (or 10000021114 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 90000189999 in words is "ninety billion, one hundred eighty-nine thousand, nine hundred ninety-nine".