131171807 has 4 divisors (see below), whose sum is σ = 141261960. Its totient is φ = 121081656.

The previous prime is 131171797. The next prime is 131171867. The reversal of 131171807 is 708171131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708171131 = 89 ⋅7956979.

It is a cyclic number.

It is not a de Polignac number, because 131171807 - 2⁶ = 131171743 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 131171807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131171867) 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, 5045057 + ... + 5045082.

It is an arithmetic number, because the mean of its divisors is an integer number (35315490).

Almost surely, 2^131171807 is an apocalyptic number.

131171807 is a deficient number, since it is larger than the sum of its proper divisors (10090153).

131171807 is a wasteful number, since it uses less digits than its factorization.

131171807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090152.

The product of its (nonzero) digits is 1176, while the sum is 29.

The square root of 131171807 is about 11453.0261066672. The cubic root of 131171807 is about 508.0972376225.

The spelling of 131171807 in words is "one hundred thirty-one million, one hundred seventy-one thousand, eight hundred seven".