131665771 has 8 divisors (see below), whose sum is σ = 136778400. Its totient is φ = 126591360.

The previous prime is 131665769. The next prime is 131665811. The reversal of 131665771 is 177566131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131665771 - 2¹ = 131665769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131665771.

It is not an unprimeable number, because it can be changed into a prime (131665571) 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 7 ways as a sum of consecutive naturals, for example, 2431 + ... + 16408.

It is an arithmetic number, because the mean of its divisors is an integer number (17097300).

Almost surely, 2^131665771 is an apocalyptic number.

131665771 is a deficient number, since it is larger than the sum of its proper divisors (5112629).

131665771 is a wasteful number, since it uses less digits than its factorization.

131665771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19109.

The product of its digits is 26460, while the sum is 37.

The square root of 131665771 is about 11474.5706237750. The cubic root of 131665771 is about 508.7342326187.

The spelling of 131665771 in words is "one hundred thirty-one million, six hundred sixty-five thousand, seven hundred seventy-one".