890999999099 has 6 divisors (see below), whose sum is σ = 1036469386764. Its totient is φ = 763714284900.

The previous prime is 890999999077. The next prime is 890999999117. The reversal of 890999999099 is 990999999098.

It is a happy number.

It is not a de Polignac number, because 890999999099 - 2¹⁶ = 890999933563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (890999999009) 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, 9091836677 + ... + 9091836774.

It is an arithmetic number, because the mean of its divisors is an integer number (172744897794).

Almost surely, 2^890999999099 is an apocalyptic number.

890999999099 is a deficient number, since it is larger than the sum of its proper divisors (145469387665).

890999999099 is a wasteful number, since it uses less digits than its factorization.

890999999099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18183673465 (or 18183673458 counting only the distinct ones).

The product of its (nonzero) digits is 3099363912, while the sum is 89.

Subtracting 890999999099 from its reverse (990999999098), we obtain a palindrome (99999999999).

The spelling of 890999999099 in words is "eight hundred ninety billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, ninety-nine".