139318509 has 16 divisors (see below), whose sum is σ = 202870080. Its totient is φ = 84341760.

The previous prime is 139318499. The next prime is 139318537. The reversal of 139318509 is 905813931.

It is not a de Polignac number, because 139318509 - 2⁴ = 139318493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139318549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38427 + ... + 41895.

It is an arithmetic number, because the mean of its divisors is an integer number (12679380).

Almost surely, 2^139318509 is an apocalyptic number.

It is an amenable number.

139318509 is a deficient number, since it is larger than the sum of its proper divisors (63551571).

139318509 is a wasteful number, since it uses less digits than its factorization.

139318509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 139318509 is about 11803.3261837501. The cubic root of 139318509 is about 518.4055065275.

The spelling of 139318509 in words is "one hundred thirty-nine million, three hundred eighteen thousand, five hundred nine".