1231123201313 has 4 divisors (see below), whose sum is σ = 1231128075540. Its totient is φ = 1231118327088.

The previous prime is 1231123201309. The next prime is 1231123201333. The reversal of 1231123201313 is 3131023211321.

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 721424300689 + 509698900624 = 849367^2 + 713932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231123201313 - 2² = 1231123201309 is a prime.

It is a super-2 number, since 2×1231123201313² (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 (1231123201303) 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 3 ways as a sum of consecutive naturals, for example, 2036270 + ... + 2570727.

It is an arithmetic number, because the mean of its divisors is an integer number (307782018885).

Almost surely, 2^{1231123201313} is an apocalyptic number.

It is an amenable number.

1231123201313 is a deficient number, since it is larger than the sum of its proper divisors (4874227).

1231123201313 is an equidigital number, since it uses as much as digits as its factorization.

1231123201313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874226.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231123201313 its reverse (3131023211321), we get a palindrome (4362146412634).

The spelling of 1231123201313 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred one thousand, three hundred thirteen".