11231231231 has 8 divisors (see below), whose sum is σ = 12253112400. Its totient is φ = 10209493440.

The previous prime is 11231231213. The next prime is 11231231243. The reversal of 11231231231 is 13213213211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11231231231 - 2²² = 11227036927 is a prime.

It is a super-2 number, since 2×11231231231² (a number of 21 digits) 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 (11231231261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189665 + ... + 241733.

It is an arithmetic number, because the mean of its divisors is an integer number (1531639050).

Almost surely, 2^11231231231 is an apocalyptic number.

11231231231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11231231231 is a deficient number, since it is larger than the sum of its proper divisors (1021881169).

11231231231 is a wasteful number, since it uses less digits than its factorization.

11231231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71689.

The product of its digits is 216, while the sum is 20.

Adding to 11231231231 its reverse (13213213211), we get a palindrome (24444444442).

The spelling of 11231231231 in words is "eleven billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".