139871 has 2 divisors, whose sum is σ = 139872. Its totient is φ = 139870.

The previous prime is 139861. The next prime is 139883. The reversal of 139871 is 178931.

139871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (178931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139871 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139871.

It is not a weakly prime, because it can be changed into another prime (139801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69935 + 69936.

It is an arithmetic number, because the mean of its divisors is an integer number (69936).

2¹³⁹⁸⁷¹ is an apocalyptic number.

139871 is a deficient number, since it is larger than the sum of its proper divisors (1).

139871 is an equidigital number, since it uses as much as digits as its factorization.

139871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 139871 is about 373.9933154483. The cubic root of 139871 is about 51.9089877428.

Subtracting 139871 from its reverse (178931), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 139871 in words is "one hundred thirty-nine thousand, eight hundred seventy-one".