11129891 has 4 divisors (see below), whose sum is σ = 11214984. Its totient is φ = 11044800.

The previous prime is 11129879. The next prime is 11129893. The reversal of 11129891 is 19892111.

11129891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19892111 = 31 ⋅641681.

It is a cyclic number.

It is not a de Polignac number, because 11129891 - 2⁶ = 11129827 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (11129893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42350 + ... + 42611.

It is an arithmetic number, because the mean of its divisors is an integer number (2803746).

Almost surely, 2^11129891 is an apocalyptic number.

11129891 is a deficient number, since it is larger than the sum of its proper divisors (85093).

11129891 is an equidigital number, since it uses as much as digits as its factorization.

11129891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85092.

The product of its digits is 1296, while the sum is 32.

The square root of 11129891 is about 3336.1491273623. The cubic root of 11129891 is about 223.2699646952.

The spelling of 11129891 in words is "eleven million, one hundred twenty-nine thousand, eight hundred ninety-one".