1311031331305 has 8 divisors (see below), whose sum is σ = 1573244390592. Its totient is φ = 1048820536368.

The previous prime is 1311031331303. The next prime is 1311031331371. The reversal of 1311031331305 is 5031331301131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311031331305 - 2¹ = 1311031331303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311031331305.

It is not an unprimeable number, because it can be changed into a prime (1311031331303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1220002 + ... + 2027428.

It is an arithmetic number, because the mean of its divisors is an integer number (196655548824).

Almost surely, 2^{1311031331305} is an apocalyptic number.

It is an amenable number.

1311031331305 is a deficient number, since it is larger than the sum of its proper divisors (262213059287).

1311031331305 is an equidigital number, since it uses as much as digits as its factorization.

1311031331305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132175.

The product of its (nonzero) digits is 1215, while the sum is 25.

Adding to 1311031331305 its reverse (5031331301131), we get a palindrome (6342362632436).

The spelling of 1311031331305 in words is "one trillion, three hundred eleven billion, thirty-one million, three hundred thirty-one thousand, three hundred five".