139107109 has 4 divisors (see below), whose sum is σ = 139266604. Its totient is φ = 138947616.

The previous prime is 139107097. The next prime is 139107119. The reversal of 139107109 is 901701931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107184609 + 31922500 = 10353^2 + 5650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139107109 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 (139107119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78432 + ... + 80185.

It is an arithmetic number, because the mean of its divisors is an integer number (34816651).

Almost surely, 2^139107109 is an apocalyptic number.

It is an amenable number.

139107109 is a deficient number, since it is larger than the sum of its proper divisors (159495).

139107109 is an equidigital number, since it uses as much as digits as its factorization.

139107109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159494.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 139107109 is about 11794.3676812282. The cubic root of 139107109 is about 518.1431666508.

The spelling of 139107109 in words is "one hundred thirty-nine million, one hundred seven thousand, one hundred nine".