131785165 has 4 divisors (see below), whose sum is σ = 158142204. Its totient is φ = 105428128.

The previous prime is 131785151. The next prime is 131785169. The reversal of 131785165 is 561587131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21409129 + 110376036 = 4627^2 + 10506^2 .

It is a cyclic number.

It is not a de Polignac number, because 131785165 - 2¹³ = 131776973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131785169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13178512 + ... + 13178521.

It is an arithmetic number, because the mean of its divisors is an integer number (39535551).

Almost surely, 2^131785165 is an apocalyptic number.

It is an amenable number.

131785165 is a deficient number, since it is larger than the sum of its proper divisors (26357039).

131785165 is an equidigital number, since it uses as much as digits as its factorization.

131785165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26357038.

The product of its digits is 25200, while the sum is 37.

The square root of 131785165 is about 11479.7719925093. The cubic root of 131785165 is about 508.8879588914.

The spelling of 131785165 in words is "one hundred thirty-one million, seven hundred eighty-five thousand, one hundred sixty-five".