11156789 has 4 divisors (see below), whose sum is σ = 12750624. Its totient is φ = 9562956.

The previous prime is 11156779. The next prime is 11156791. The reversal of 11156789 is 98765111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11156789 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796907 + ... + 796920.

It is an arithmetic number, because the mean of its divisors is an integer number (3187656).

Almost surely, 2^11156789 is an apocalyptic number.

It is an amenable number.

11156789 is a deficient number, since it is larger than the sum of its proper divisors (1593835).

11156789 is an equidigital number, since it uses as much as digits as its factorization.

11156789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593834.

The product of its digits is 15120, while the sum is 38.

The square root of 11156789 is about 3340.1779892694. The cubic root of 11156789 is about 223.4496814621.

The spelling of 11156789 in words is "eleven million, one hundred fifty-six thousand, seven hundred eighty-nine".