136619909 has 4 divisors (see below), whose sum is σ = 138266016. Its totient is φ = 134973804.

The previous prime is 136619897. The next prime is 136619927. The reversal of 136619909 is 909916631.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 136619909 - 2⁸ = 136619653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 136619909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136619969) 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, 822929 + ... + 823094.

It is an arithmetic number, because the mean of its divisors is an integer number (34566504).

Almost surely, 2^136619909 is an apocalyptic number.

It is an amenable number.

136619909 is a deficient number, since it is larger than the sum of its proper divisors (1646107).

136619909 is an equidigital number, since it uses as much as digits as its factorization.

136619909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646106.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 136619909 is about 11688.4519505365. The cubic root of 136619909 is about 515.0364871877.

The spelling of 136619909 in words is "one hundred thirty-six million, six hundred nineteen thousand, nine hundred nine".