139871109 has 32 divisors (see below), whose sum is σ = 218486016. Its totient is φ = 77944320.

The previous prime is 139871093. The next prime is 139871111. The reversal of 139871109 is 901178931.

It is not a de Polignac number, because 139871109 - 2⁴ = 139871093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139871129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175099 + ... + 175895.

It is an arithmetic number, because the mean of its divisors is an integer number (6827688).

Almost surely, 2^139871109 is an apocalyptic number.

It is an amenable number.

139871109 is a deficient number, since it is larger than the sum of its proper divisors (78614907).

139871109 is a wasteful number, since it uses less digits than its factorization.

139871109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 139871109 is about 11826.7116731575. The cubic root of 139871109 is about 519.0900122687.

The spelling of 139871109 in words is "one hundred thirty-nine million, eight hundred seventy-one thousand, one hundred nine".