163581823 has 4 divisors (see below), whose sum is σ = 168858688. Its totient is φ = 158304960.

The previous prime is 163581791. The next prime is 163581857. The reversal of 163581823 is 328185361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163581823 - 2⁵ = 163581791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163581863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2638386 + ... + 2638447.

It is an arithmetic number, because the mean of its divisors is an integer number (42214672).

Almost surely, 2^163581823 is an apocalyptic number.

163581823 is a deficient number, since it is larger than the sum of its proper divisors (5276865).

163581823 is an equidigital number, since it uses as much as digits as its factorization.

163581823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276864.

The product of its digits is 34560, while the sum is 37.

The square root of 163581823 is about 12789.9109848349. The cubic root of 163581823 is about 546.9047322632.

It can be divided in two parts, 1635818 and 23, that added together give a square (1635841 = 1279²).

The spelling of 163581823 in words is "one hundred sixty-three million, five hundred eighty-one thousand, eight hundred twenty-three".