136691444 has 6 divisors (see below), whose sum is σ = 239210034. Its totient is φ = 68345720.

The previous prime is 136691419. The next prime is 136691447. The reversal of 136691444 is 444196631.

136691444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 35344 = 11690^2 + 188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 136691398 and 136691407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136691447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17086427 + ... + 17086434.

It is an arithmetic number, because the mean of its divisors is an integer number (39868339).

Almost surely, 2^136691444 is an apocalyptic number.

It is an amenable number.

136691444 is a deficient number, since it is larger than the sum of its proper divisors (102518590).

136691444 is a wasteful number, since it uses less digits than its factorization.

136691444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34172865 (or 34172863 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 136691444 is about 11691.5116216852. The cubic root of 136691444 is about 515.1263635628.

The spelling of 136691444 in words is "one hundred thirty-six million, six hundred ninety-one thousand, four hundred forty-four".