11111231 has 4 divisors (see below), whose sum is σ = 11594352. Its totient is φ = 10628112.

The previous prime is 11111209. The next prime is 11111267. The reversal of 11111231 is 13211111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111231 - 2¹⁰ = 11110207 is a prime.

It is a super-2 number, since 2×11111231² = 246918908670722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111131) 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, 241526 + ... + 241571.

It is an arithmetic number, because the mean of its divisors is an integer number (2898588).

Almost surely, 2^11111231 is an apocalyptic number.

11111231 is a deficient number, since it is larger than the sum of its proper divisors (483121).

11111231 is an equidigital number, since it uses as much as digits as its factorization.

11111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483120.

The product of its digits is 6, while the sum is 11.

The square root of 11111231 is about 3333.3513166182. The cubic root of 11111231 is about 223.1451192669.

Adding to 11111231 its reverse (13211111), we get a palindrome (24322342).

The spelling of 11111231 in words is "eleven million, one hundred eleven thousand, two hundred thirty-one".