163240243 has 4 divisors (see below), whose sum is σ = 163267720. Its totient is φ = 163212768.

The previous prime is 163240219. The next prime is 163240247. The reversal of 163240243 is 342042361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342042361 = 23 ⋅14871407.

It is a cyclic number.

It is not a de Polignac number, because 163240243 - 2⁹ = 163239731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163240247) 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, 705 + ... + 18082.

It is an arithmetic number, because the mean of its divisors is an integer number (40816930).

Almost surely, 2^163240243 is an apocalyptic number.

163240243 is a deficient number, since it is larger than the sum of its proper divisors (27477).

163240243 is an equidigital number, since it uses as much as digits as its factorization.

163240243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27476.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 163240243 is about 12776.5505125601. The cubic root of 163240243 is about 546.5237977252.

The spelling of 163240243 in words is "one hundred sixty-three million, two hundred forty thousand, two hundred forty-three".