131236165 has 16 divisors (see below), whose sum is σ = 163522800. Its totient is φ = 100989952.

The previous prime is 131236159. The next prime is 131236181. The reversal of 131236165 is 561632131.

It can be written as a sum of positive squares in 8 ways, for example, as 26399044 + 104837121 = 5138^2 + 10239^2 .

It is a cyclic number.

It is not a de Polignac number, because 131236165 - 2⁹ = 131235653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40941 + ... + 44029.

It is an arithmetic number, because the mean of its divisors is an integer number (10220175).

Almost surely, 2^131236165 is an apocalyptic number.

It is an amenable number.

131236165 is a deficient number, since it is larger than the sum of its proper divisors (32286635).

131236165 is a wasteful number, since it uses less digits than its factorization.

131236165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416.

The product of its digits is 3240, while the sum is 28.

The square root of 131236165 is about 11455.8354125747. The cubic root of 131236165 is about 508.1803214707.

Adding to 131236165 its reverse (561632131), we get a palindrome (692868296).

The spelling of 131236165 in words is "one hundred thirty-one million, two hundred thirty-six thousand, one hundred sixty-five".