1311423356365 has 4 divisors (see below), whose sum is σ = 1573708027644. Its totient is φ = 1049138685088.

The previous prime is 1311423356357. The next prime is 1311423356371. The reversal of 1311423356365 is 5636533241131.

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 196247228004 + 1115176128361 = 442998^2 + 1056019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311423356365 - 2³ = 1311423356357 is a prime.

It is a super-3 number, since 3×1311423356365³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131142335632 + ... + 131142335641.

It is an arithmetic number, because the mean of its divisors is an integer number (393427006911).

Almost surely, 2^{1311423356365} is an apocalyptic number.

It is an amenable number.

1311423356365 is a deficient number, since it is larger than the sum of its proper divisors (262284671279).

1311423356365 is an equidigital number, since it uses as much as digits as its factorization.

1311423356365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262284671278.

The product of its digits is 583200, while the sum is 43.

Adding to 1311423356365 its reverse (5636533241131), we get a palindrome (6947956597496).

The spelling of 1311423356365 in words is "one trillion, three hundred eleven billion, four hundred twenty-three million, three hundred fifty-six thousand, three hundred sixty-five".