1231013111 has 8 divisors (see below), whose sum is σ = 1252521600. Its totient is φ = 1209526200.

The previous prime is 1231013099. The next prime is 1231013209. The reversal of 1231013111 is 1113101321.

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 a de Polignac number, because none of the positive numbers 2^k-1231013111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231013011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146420 + ... + 154598.

It is an arithmetic number, because the mean of its divisors is an integer number (156565200).

Almost surely, 2^1231013111 is an apocalyptic number.

1231013111 is a deficient number, since it is larger than the sum of its proper divisors (21508489).

1231013111 is an equidigital number, since it uses as much as digits as its factorization.

1231013111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1231013111 is about 35085.7964281844. The cubic root of 1231013111 is about 1071.7353594049.

Adding to 1231013111 its reverse (1113101321), we get a palindrome (2344114432).

The spelling of 1231013111 in words is "one billion, two hundred thirty-one million, thirteen thousand, one hundred eleven".