11111389 has 4 divisors (see below), whose sum is σ = 11121660. Its totient is φ = 11101120.

The previous prime is 11111341. The next prime is 11111393. The reversal of 11111389 is 98311111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11002489 + 108900 = 3317^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111389 - 2²¹ = 9014237 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 (11115389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3292 + ... + 5749.

It is an arithmetic number, because the mean of its divisors is an integer number (2780415).

Almost surely, 2^11111389 is an apocalyptic number.

It is an amenable number.

11111389 is a deficient number, since it is larger than the sum of its proper divisors (10271).

11111389 is an equidigital number, since it uses as much as digits as its factorization.

11111389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270.

The product of its digits is 216, while the sum is 25.

The square root of 11111389 is about 3333.3750164060. The cubic root of 11111389 is about 223.1461769583.

It can be divided in two parts, 1111 and 1389, that added together give a square (2500 = 50²).

The spelling of 11111389 in words is "eleven million, one hundred eleven thousand, three hundred eighty-nine".