136815647 has 4 divisors (see below), whose sum is σ = 140152656. Its totient is φ = 133478640.

The previous prime is 136815587. The next prime is 136815671. The reversal of 136815647 is 746518631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746518631 = 9851 ⋅75781.

It is a cyclic number.

It is not a de Polignac number, because 136815647 - 2⁶ = 136815583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3336967 = 136815647 / (1 + 3 + 6 + 8 + 1 + 5 + 6 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136815697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668443 + ... + 1668524.

It is an arithmetic number, because the mean of its divisors is an integer number (35038164).

Almost surely, 2^136815647 is an apocalyptic number.

136815647 is a deficient number, since it is larger than the sum of its proper divisors (3337009).

136815647 is an equidigital number, since it uses as much as digits as its factorization.

136815647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337008.

The product of its digits is 120960, while the sum is 41.

The square root of 136815647 is about 11696.8220897815. The cubic root of 136815647 is about 515.2823374100.

The spelling of 136815647 in words is "one hundred thirty-six million, eight hundred fifteen thousand, six hundred forty-seven".