243365881 has 4 divisors (see below), whose sum is σ = 265490064. Its totient is φ = 221241700.

The previous prime is 243365879. The next prime is 243365911. The reversal of 243365881 is 188563342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243365881 - 2¹ = 243365879 is a prime.

It is a super-2 number, since 2×243365881² = 118453904069812322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243365831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11062075 + ... + 11062096.

It is an arithmetic number, because the mean of its divisors is an integer number (66372516).

Almost surely, 2^243365881 is an apocalyptic number.

It is an amenable number.

243365881 is a deficient number, since it is larger than the sum of its proper divisors (22124183).

243365881 is a wasteful number, since it uses less digits than its factorization.

243365881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22124182.

The product of its digits is 138240, while the sum is 40.

The square root of 243365881 is about 15600.1884924510. The cubic root of 243365881 is about 624.3381845679.

The spelling of 243365881 in words is "two hundred forty-three million, three hundred sixty-five thousand, eight hundred eighty-one".