139544109 has 12 divisors (see below), whose sum is σ = 213420636. Its totient is φ = 87556992.

The previous prime is 139544063. The next prime is 139544117. The reversal of 139544109 is 901445931.

It is a happy number.

139544109 is a `hidden beast` number, since 1 + 3 + 9 + 544 + 109 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 126562500 + 12981609 = 11250^2 + 3603^2 .

It is not a de Polignac number, because 139544109 - 2⁷ = 139543981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139544129) 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 11 ways as a sum of consecutive naturals, for example, 455874 + ... + 456179.

It is an arithmetic number, because the mean of its divisors is an integer number (17785053).

Almost surely, 2^139544109 is an apocalyptic number.

It is an amenable number.

139544109 is a deficient number, since it is larger than the sum of its proper divisors (73876527).

139544109 is a wasteful number, since it uses less digits than its factorization.

139544109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912076 (or 912073 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 139544109 is about 11812.8789463026. The cubic root of 139544109 is about 518.6851755451.

The spelling of 139544109 in words is "one hundred thirty-nine million, five hundred forty-four thousand, one hundred nine".