139685171 has 2 divisors, whose sum is σ = 139685172. Its totient is φ = 139685170.

The previous prime is 139685153. The next prime is 139685177. The reversal of 139685171 is 171586931.

139685171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (171586931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139685171 - 2¹⁰ = 139684147 is a prime.

It is a Chen prime.

It is equal to p_7895354 and since 139685171 and 7895354 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (139685177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69842585 + 69842586.

It is an arithmetic number, because the mean of its divisors is an integer number (69842586).

Almost surely, 2^139685171 is an apocalyptic number.

139685171 is a deficient number, since it is larger than the sum of its proper divisors (1).

139685171 is an equidigital number, since it uses as much as digits as its factorization.

139685171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 139685171 is about 11818.8481249232. The cubic root of 139685171 is about 518.8598924103.

The spelling of 139685171 in words is "one hundred thirty-nine million, six hundred eighty-five thousand, one hundred seventy-one".