1231111113 has 8 divisors (see below), whose sum is σ = 1679655648. Its totient is φ = 801653664.

The previous prime is 1231111093. The next prime is 1231111129. The reversal of 1231111113 is 3111111321.

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

It is not a de Polignac number, because 1231111113 - 2⁵ = 1231111081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231111092 and 1231111101.

It is not an unprimeable number, because it can be changed into a prime (1231115113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4771620 + ... + 4771877.

It is an arithmetic number, because the mean of its divisors is an integer number (209956956).

Almost surely, 2^1231111113 is an apocalyptic number.

It is an amenable number.

1231111113 is a deficient number, since it is larger than the sum of its proper divisors (448544535).

1231111113 is an equidigital number, since it uses as much as digits as its factorization.

1231111113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9543543.

The product of its digits is 18, while the sum is 15.

The square root of 1231111113 is about 35087.1930054258. The cubic root of 1231111113 is about 1071.7637992378.

Adding to 1231111113 its reverse (3111111321), we get a palindrome (4342222434).

The spelling of 1231111113 in words is "one billion, two hundred thirty-one million, one hundred eleven thousand, one hundred thirteen".