136561643 has 8 divisors (see below), whose sum is σ = 138475008. Its totient is φ = 134654824.

The previous prime is 136561637. The next prime is 136561657. The reversal of 136561643 is 346165631.

136561643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136561643 - 2²⁰ = 135513067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136561673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52430 + ... + 54972.

It is an arithmetic number, because the mean of its divisors is an integer number (17309376).

Almost surely, 2^136561643 is an apocalyptic number.

136561643 is a deficient number, since it is larger than the sum of its proper divisors (1913365).

136561643 is an equidigital number, since it uses as much as digits as its factorization.

136561643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273.

The product of its digits is 38880, while the sum is 35.

The square root of 136561643 is about 11685.9592246422. The cubic root of 136561643 is about 514.9632587607.

It can be divided in two parts, 13 and 6561643, that added together give a palindrome (6561656).

The spelling of 136561643 in words is "one hundred thirty-six million, five hundred sixty-one thousand, six hundred forty-three".