243820163 has 4 divisors (see below), whose sum is σ = 243851400. Its totient is φ = 243788928.

The previous prime is 243820147. The next prime is 243820189. The reversal of 243820163 is 361028342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 361028342 = 2 ⋅180514171.

It is a cyclic number.

It is not a de Polignac number, because 243820163 - 2⁴ = 243820147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243820463) 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, 7331 + ... + 23267.

It is an arithmetic number, because the mean of its divisors is an integer number (60962850).

Almost surely, 2^243820163 is an apocalyptic number.

243820163 is a deficient number, since it is larger than the sum of its proper divisors (31237).

243820163 is a wasteful number, since it uses less digits than its factorization.

243820163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31236.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 243820163 is about 15614.7418486506. The cubic root of 243820163 is about 624.7264193566.

The spelling of 243820163 in words is "two hundred forty-three million, eight hundred twenty thousand, one hundred sixty-three".