139936871 has 2 divisors, whose sum is σ = 139936872. Its totient is φ = 139936870.

The previous prime is 139936859. The next prime is 139936873. The reversal of 139936871 is 178639931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139936871 is a prime.

Together with 139936873, 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 (139936873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69968435 + 69968436.

It is an arithmetic number, because the mean of its divisors is an integer number (69968436).

Almost surely, 2^139936871 is an apocalyptic number.

139936871 is a deficient number, since it is larger than the sum of its proper divisors (1).

139936871 is an equidigital number, since it uses as much as digits as its factorization.

139936871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 139936871 is about 11829.4915782547. The cubic root of 139936871 is about 519.1713515559.

The spelling of 139936871 in words is "one hundred thirty-nine million, nine hundred thirty-six thousand, eight hundred seventy-one".