1311599605 has 16 divisors (see below), whose sum is σ = 1581770160. Its totient is φ = 1044062208.

The previous prime is 1311599603. The next prime is 1311599609. The reversal of 1311599605 is 5069951131.

It can be written as a sum of positive squares in 8 ways, for example, as 2390116 + 1309209489 = 1546^2 + 36183^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311599605 - 2¹ = 1311599603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311599603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375809 + ... + 1376761.

It is an arithmetic number, because the mean of its divisors is an integer number (98860635).

Almost surely, 2^1311599605 is an apocalyptic number.

It is an amenable number.

1311599605 is a deficient number, since it is larger than the sum of its proper divisors (270170555).

1311599605 is an equidigital number, since it uses as much as digits as its factorization.

1311599605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 1311599605 is about 36216.0131019415. The cubic root of 1311599605 is about 1094.6293596259.

The spelling of 1311599605 in words is "one billion, three hundred eleven million, five hundred ninety-nine thousand, six hundred five".