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11231 = 111021

11231 has 4 divisors (see below), whose sum is σ = 12264. Its totient is φ = 10200.

The previous prime is 11213. The next prime is 11239. The reversal of 11231 is 13211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211 = 111201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-11231 is a prime.

It is a super-2 number, since 2×112312 = 252270722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 6 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11239) 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, 500 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (3066).

211231 is an apocalyptic number.

11231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11231 is a deficient number, since it is larger than the sum of its proper divisors (1033).

11231 is a wasteful number, since it uses less digits than its factorization.

11231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 6, while the sum is 8.

The square root of 11231 is about 105.9764124699. The cubic root of 11231 is about 22.3944023002.

Adding to 11231 its reverse (13211), we get a palindrome (24442).

It can be divided in two parts, 11 and 231, that added together give a palindrome (242).

The spelling of 11231 in words is "eleven thousand, two hundred thirty-one".

Divisors: 1 11 1021 11231