136839491188509 has 16 divisors (see below), whose sum is σ = 184627156168832. Its totient is φ = 90142952951808.

The previous prime is 136839491188483. The next prime is 136839491188541. The reversal of 136839491188509 is 905881194938631.

It is not a de Polignac number, because 136839491188509 - 2²⁸ = 136839222753053 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 (136839491188549) 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, 484373284 + ... + 484655709.

It is an arithmetic number, because the mean of its divisors is an integer number (11539197260552).

Almost surely, 2^{136839491188509} is an apocalyptic number.

It is an amenable number.

136839491188509 is a deficient number, since it is larger than the sum of its proper divisors (47787664980323).

136839491188509 is a wasteful number, since it uses less digits than its factorization.

136839491188509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969029556.

The product of its (nonzero) digits is 403107840, while the sum is 75.

The spelling of 136839491188509 in words is "one hundred thirty-six trillion, eight hundred thirty-nine billion, four hundred ninety-one million, one hundred eighty-eight thousand, five hundred nine".