131685871 has 2 divisors, whose sum is σ = 131685872. Its totient is φ = 131685870.

The previous prime is 131685847. The next prime is 131685877. The reversal of 131685871 is 178586131.

It is a strong prime.

It is an emirp because it is prime and its reverse (178586131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131685871 - 2¹¹ = 131683823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131685877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65842935 + 65842936.

It is an arithmetic number, because the mean of its divisors is an integer number (65842936).

Almost surely, 2^131685871 is an apocalyptic number.

131685871 is a deficient number, since it is larger than the sum of its proper divisors (1).

131685871 is an equidigital number, since it uses as much as digits as its factorization.

131685871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 131685871 is about 11475.4464401173. The cubic root of 131685871 is about 508.7601189664.

The spelling of 131685871 in words is "one hundred thirty-one million, six hundred eighty-five thousand, eight hundred seventy-one".