139717871 has 2 divisors, whose sum is σ = 139717872. Its totient is φ = 139717870.

The previous prime is 139717867. The next prime is 139717889. The reversal of 139717871 is 178717931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139717871 - 2² = 139717867 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139717861) 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 as a sum of consecutive naturals, namely, 69858935 + 69858936.

It is an arithmetic number, because the mean of its divisors is an integer number (69858936).

Almost surely, 2^139717871 is an apocalyptic number.

139717871 is a deficient number, since it is larger than the sum of its proper divisors (1).

139717871 is an equidigital number, since it uses as much as digits as its factorization.

139717871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 44.

The square root of 139717871 is about 11820.2314275144. The cubic root of 139717871 is about 518.9003772487.

The spelling of 139717871 in words is "one hundred thirty-nine million, seven hundred seventeen thousand, eight hundred seventy-one".