131639 has 2 divisors, whose sum is σ = 131640. Its totient is φ = 131638.

The previous prime is 131627. The next prime is 131641. The reversal of 131639 is 936131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131639 - 2¹⁶ = 66103 is a prime.

Together with 131641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65819 + 65820.

It is an arithmetic number, because the mean of its divisors is an integer number (65820).

2¹³¹⁶³⁹ is an apocalyptic number.

131639 is a deficient number, since it is larger than the sum of its proper divisors (1).

131639 is an equidigital number, since it uses as much as digits as its factorization.

131639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 23.

The square root of 131639 is about 362.8208924525. The cubic root of 131639 is about 50.8699750745.

The spelling of 131639 in words is "one hundred thirty-one thousand, six hundred thirty-nine".