1123123231313 has 4 divisors (see below), whose sum is σ = 1123801038180. Its totient is φ = 1122445424448.

The previous prime is 1123123231303. The next prime is 1123123231339. The reversal of 1123123231313 is 3131323213211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109291731649 + 1013831499664 = 330593^2 + 1006892^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123123231313 - 2⁶ = 1123123231249 is a prime.

It is a super-2 number, since 2×1123123231313² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123123231303) 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, 338900948 + ... + 338904261.

It is an arithmetic number, because the mean of its divisors is an integer number (280950259545).

Almost surely, 2^{1123123231313} is an apocalyptic number.

It is an amenable number.

1123123231313 is a deficient number, since it is larger than the sum of its proper divisors (677806867).

1123123231313 is an equidigital number, since it uses as much as digits as its factorization.

1123123231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677806866.

The product of its digits is 1944, while the sum is 26.

Adding to 1123123231313 its reverse (3131323213211), we get a palindrome (4254446444524).

The spelling of 1123123231313 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred thirty-one thousand, three hundred thirteen".