139556609 has 4 divisors (see below), whose sum is σ = 139663104. Its totient is φ = 139450116.

The previous prime is 139556591. The next prime is 139556687. The reversal of 139556609 is 906655931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906655931 = 10837 ⋅83663.

It is a cyclic number.

It is not a de Polignac number, because 139556609 - 2⁸ = 139556353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139556609.

It is not an unprimeable number, because it can be changed into a prime (139556309) 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 3 ways as a sum of consecutive naturals, for example, 51257 + ... + 53910.

It is an arithmetic number, because the mean of its divisors is an integer number (34915776).

Almost surely, 2^139556609 is an apocalyptic number.

It is an amenable number.

139556609 is a deficient number, since it is larger than the sum of its proper divisors (106495).

139556609 is a wasteful number, since it uses less digits than its factorization.

139556609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106494.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 139556609 is about 11813.4080180107. The cubic root of 139556609 is about 518.7006625744.

The spelling of 139556609 in words is "one hundred thirty-nine million, five hundred fifty-six thousand, six hundred nine".