1311309813 has 16 divisors (see below), whose sum is σ = 1920168000. Its totient is φ = 789396480.

The previous prime is 1311309809. The next prime is 1311309829. The reversal of 1311309813 is 3189031131.

It is a happy number.

It is not a de Polignac number, because 1311309813 - 2² = 1311309809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311309113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128428 + ... + 138261.

It is an arithmetic number, because the mean of its divisors is an integer number (120010500).

Almost surely, 2^1311309813 is an apocalyptic number.

It is an amenable number.

1311309813 is a deficient number, since it is larger than the sum of its proper divisors (608858187).

1311309813 is a wasteful number, since it uses less digits than its factorization.

1311309813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266852.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1311309813 is about 36212.0119987829. The cubic root of 1311309813 is about 1094.5487358859.

The spelling of 1311309813 in words is "one billion, three hundred eleven million, three hundred nine thousand, eight hundred thirteen".