139605871 has 2 divisors, whose sum is σ = 139605872. Its totient is φ = 139605870.

The previous prime is 139605841. The next prime is 139605899. The reversal of 139605871 is 178506931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139605871 - 2⁷ = 139605743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139605841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69802935 + 69802936.

It is an arithmetic number, because the mean of its divisors is an integer number (69802936).

Almost surely, 2^139605871 is an apocalyptic number.

139605871 is a deficient number, since it is larger than the sum of its proper divisors (1).

139605871 is an equidigital number, since it uses as much as digits as its factorization.

139605871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 139605871 is about 11815.4928377956. The cubic root of 139605871 is about 518.7616873353.

The spelling of 139605871 in words is "one hundred thirty-nine million, six hundred five thousand, eight hundred seventy-one".