243811881 has 12 divisors (see below), whose sum is σ = 352385280. Its totient is φ = 162443160.

The previous prime is 243811859. The next prime is 243811901. The reversal of 243811881 is 188118342.

It is not a de Polignac number, because 243811881 - 2¹³ = 243803689 is a prime.

It is a super-2 number, since 2×243811881² = 118888466633516322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243811801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9600 + ... + 24078.

It is an arithmetic number, because the mean of its divisors is an integer number (29365440).

Almost surely, 2^243811881 is an apocalyptic number.

It is an amenable number.

243811881 is a deficient number, since it is larger than the sum of its proper divisors (108573399).

243811881 is a wasteful number, since it uses less digits than its factorization.

243811881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16356 (or 16353 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 243811881 is about 15614.4766482902. The cubic root of 243811881 is about 624.7193457787.

It can be divided in two parts, 24381 and 1881, that added together give a palindrome (26262).

The spelling of 243811881 in words is "two hundred forty-three million, eight hundred eleven thousand, eight hundred eighty-one".