1123131313231 has 4 divisors (see below), whose sum is σ = 1123135192872. Its totient is φ = 1123127433592.

The previous prime is 1123131313141. The next prime is 1123131313247. The reversal of 1123131313231 is 1323131313211.

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 1123131313231 - 2¹⁹ = 1123130788943 is a prime.

It is a super-2 number, since 2×1123131313231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123131313196 and 1123131313205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123131343231) 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, 1467196 + ... + 2097361.

It is an arithmetic number, because the mean of its divisors is an integer number (280783798218).

Almost surely, 2^{1123131313231} is an apocalyptic number.

1123131313231 is a deficient number, since it is larger than the sum of its proper divisors (3879641).

1123131313231 is an equidigital number, since it uses as much as digits as its factorization.

1123131313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879640.

The product of its digits is 972, while the sum is 25.

Adding to 1123131313231 its reverse (1323131313211), we get a palindrome (2446262626442).

The spelling of 1123131313231 in words is "one trillion, one hundred twenty-three billion, one hundred thirty-one million, three hundred thirteen thousand, two hundred thirty-one".