163432561 has 8 divisors (see below), whose sum is σ = 165876480. Its totient is φ = 161000112.

The previous prime is 163432559. The next prime is 163432573. The reversal of 163432561 is 165234361.

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 163432561 - 2¹ = 163432559 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 (163432501) 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, 28320 + ... + 33598.

It is an arithmetic number, because the mean of its divisors is an integer number (20734560).

Almost surely, 2^163432561 is an apocalyptic number.

It is an amenable number.

163432561 is a deficient number, since it is larger than the sum of its proper divisors (2443919).

163432561 is an equidigital number, since it uses as much as digits as its factorization.

163432561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5735.

The product of its digits is 12960, while the sum is 31.

The square root of 163432561 is about 12784.0745069794. The cubic root of 163432561 is about 546.7383386018.

The spelling of 163432561 in words is "one hundred sixty-three million, four hundred thirty-two thousand, five hundred sixty-one".