138471109 has 12 divisors (see below), whose sum is σ = 168083424. Its totient is φ = 113528184.

The previous prime is 138471097. The next prime is 138471119. The reversal of 138471109 is 901174831.

It is not a de Polignac number, because 138471109 - 2⁹ = 138470597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138471119) 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, 60307 + ... + 62560.

It is an arithmetic number, because the mean of its divisors is an integer number (14006952).

Almost surely, 2^138471109 is an apocalyptic number.

It is an amenable number.

138471109 is a deficient number, since it is larger than the sum of its proper divisors (29612315).

138471109 is a wasteful number, since it uses less digits than its factorization.

138471109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122904 (or 122897 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 138471109 is about 11767.3747709504. The cubic root of 138471109 is about 517.3523071104.

The spelling of 138471109 in words is "one hundred thirty-eight million, four hundred seventy-one thousand, one hundred nine".