139505549 has 8 divisors (see below), whose sum is σ = 144587520. Its totient is φ = 134460000.

The previous prime is 139505521. The next prime is 139505609. The reversal of 139505549 is 945505931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139505549 - 2²⁰ = 138456973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139505749) 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 in 7 ways as a sum of consecutive naturals, for example, 1184 + ... + 16745.

It is an arithmetic number, because the mean of its divisors is an integer number (18073440).

Almost surely, 2^139505549 is an apocalyptic number.

It is an amenable number.

139505549 is a deficient number, since it is larger than the sum of its proper divisors (5081971).

139505549 is a wasteful number, since it uses less digits than its factorization.

139505549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18211.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 139505549 is about 11811.2467165833. The cubic root of 139505549 is about 518.6373953294.

The spelling of 139505549 in words is "one hundred thirty-nine million, five hundred five thousand, five hundred forty-nine".