2136531865 has 16 divisors (see below), whose sum is σ = 2923473168. Its totient is φ = 1484937216.

The previous prime is 2136531857. The next prime is 2136531869. The reversal of 2136531865 is 5681356312.

It can be written as a sum of positive squares in 8 ways, for example, as 3200521 + 2133331344 = 1789^2 + 46188^2 .

It is not a de Polignac number, because 2136531865 - 2³ = 2136531857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2136531869) 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, 965652 + ... + 967861.

It is an arithmetic number, because the mean of its divisors is an integer number (182717073).

Almost surely, 2^2136531865 is an apocalyptic number.

It is an amenable number.

2136531865 is a deficient number, since it is larger than the sum of its proper divisors (786941303).

2136531865 is a wasteful number, since it uses less digits than its factorization.

2136531865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933548.

The product of its digits is 129600, while the sum is 40.

The square root of 2136531865 is about 46222.6336874047. The cubic root of 2136531865 is about 1287.9622224511.

The spelling of 2136531865 in words is "two billion, one hundred thirty-six million, five hundred thirty-one thousand, eight hundred sixty-five".