136849209 has 24 divisors (see below), whose sum is σ = 212696640. Its totient is φ = 78037344.

The previous prime is 136849189. The next prime is 136849211. The reversal of 136849209 is 902948631.

It is not a de Polignac number, because 136849209 - 2⁷ = 136849081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136849709) 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 23 ways as a sum of consecutive naturals, for example, 134587 + ... + 135599.

It is an arithmetic number, because the mean of its divisors is an integer number (8862360).

Almost surely, 2^136849209 is an apocalyptic number.

It is an amenable number.

136849209 is a deficient number, since it is larger than the sum of its proper divisors (75847431).

136849209 is a wasteful number, since it uses less digits than its factorization.

136849209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1942 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 136849209 is about 11698.2566649907. The cubic root of 136849209 is about 515.3244682926.

The spelling of 136849209 in words is "one hundred thirty-six million, eight hundred forty-nine thousand, two hundred nine".