1311378005 has 64 divisors (see below), whose sum is σ = 2001162240. Its totient is φ = 804266496.

The previous prime is 1311378001. The next prime is 1311378053. The reversal of 1311378005 is 5008731131.

It is a cyclic number.

It is not a de Polignac number, because 1311378005 - 2² = 1311378001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311378001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1268969 + ... + 1270001.

It is an arithmetic number, because the mean of its divisors is an integer number (31268160).

Almost surely, 2^1311378005 is an apocalyptic number.

It is an amenable number.

1311378005 is a deficient number, since it is larger than the sum of its proper divisors (689784235).

1311378005 is a wasteful number, since it uses less digits than its factorization.

1311378005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1311378005 is about 36212.9535525618. The cubic root of 1311378005 is about 1094.5677088174.

The spelling of 1311378005 in words is "one billion, three hundred eleven million, three hundred seventy-eight thousand, five".