11105999989 has 12 divisors (see below), whose sum is σ = 13679179884. Its totient is φ = 8959461504.

The previous prime is 11105999969. The next prime is 11105999999. The reversal of 11105999989 is 98999950111.

It can be written as a sum of positive squares in 2 ways, for example, as 8642863089 + 2463136900 = 92967^2 + 49630^2 .

It is not a de Polignac number, because 11105999989 - 2¹¹ = 11105997941 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 (11105999929) 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, 6665434 + ... + 6667099.

It is an arithmetic number, because the mean of its divisors is an integer number (1139931657).

Almost surely, 2^11105999989 is an apocalyptic number.

It is an amenable number.

11105999989 is a deficient number, since it is larger than the sum of its proper divisors (2573179895).

11105999989 is a wasteful number, since it uses less digits than its factorization.

11105999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13332564 (or 13332557 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 61.

The spelling of 11105999989 in words is "eleven billion, one hundred five million, nine hundred ninety-nine thousand, nine hundred eighty-nine".