1313721365 has 32 divisors (see below), whose sum is σ = 1739646720. Its totient is φ = 944473600.

The previous prime is 1313721361. The next prime is 1313721391. The reversal of 1313721365 is 5631273131.

It is not a de Polignac number, because 1313721365 - 2² = 1313721361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313721361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2580731 + ... + 2581239.

It is an arithmetic number, because the mean of its divisors is an integer number (54363960).

Almost surely, 2^1313721365 is an apocalyptic number.

It is an amenable number.

1313721365 is a deficient number, since it is larger than the sum of its proper divisors (425925355).

1313721365 is a wasteful number, since it uses less digits than its factorization.

1313721365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its digits is 11340, while the sum is 32.

The square root of 1313721365 is about 36245.2943842370. The cubic root of 1313721365 is about 1095.2192981821.

Adding to 1313721365 its reverse (5631273131), we get a palindrome (6944994496).

The spelling of 1313721365 in words is "one billion, three hundred thirteen million, seven hundred twenty-one thousand, three hundred sixty-five".