11391111 has 12 divisors (see below), whose sum is σ = 17063592. Its totient is φ = 7593912.

The previous prime is 11391101. The next prime is 11391119. The reversal of 11391111 is 11119311.

11391111 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11391111 - 2²¹ = 9293959 is a prime.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11391119) 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, 23196 + ... + 23681.

It is an arithmetic number, because the mean of its divisors is an integer number (1421966).

Almost surely, 2^11391111 is an apocalyptic number.

11391111 is a deficient number, since it is larger than the sum of its proper divisors (5672481).

11391111 is an frugal number, since it uses more digits than its factorization.

11391111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46892 (or 46880 counting only the distinct ones).

The product of its digits is 27, while the sum is 18.

The square root of 11391111 is about 3375.0719992320. The cubic root of 11391111 is about 225.0031999545.

The spelling of 11391111 in words is "eleven million, three hundred ninety-one thousand, one hundred eleven".