163436561 has 8 divisors (see below), whose sum is σ = 167390664. Its totient is φ = 159528960.

The previous prime is 163436527. The next prime is 163436569. The reversal of 163436561 is 165634361.

163436561 is digitally balanced in base 2, 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 4 ways, for example, as 24196561 + 139240000 = 4919^2 + 11800^2 .

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 163436561 - 2¹⁰ = 163435537 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163436569) 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, 4460 + ... + 18621.

It is an arithmetic number, because the mean of its divisors is an integer number (20923833).

Almost surely, 2^163436561 is an apocalyptic number.

It is an amenable number.

163436561 is a deficient number, since it is larger than the sum of its proper divisors (3954103).

163436561 is an equidigital number, since it uses as much as digits as its factorization.

163436561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23251.

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

The square root of 163436561 is about 12784.2309506673. The cubic root of 163436561 is about 546.7427990257.

The spelling of 163436561 in words is "one hundred sixty-three million, four hundred thirty-six thousand, five hundred sixty-one".