243811641 has 4 divisors (see below), whose sum is σ = 325082192. Its totient is φ = 162541092.

The previous prime is 243811627. The next prime is 243811643. The reversal of 243811641 is 146118342.

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 not a de Polignac number, because 243811641 - 2⁹ = 243811129 is a prime.

It is a super-2 number, since 2×243811641² = 118888232574225762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243811599 and 243811608.

It is not an unprimeable number, because it can be changed into a prime (243811643) 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, 40635271 + ... + 40635276.

It is an arithmetic number, because the mean of its divisors is an integer number (81270548).

Almost surely, 2^243811641 is an apocalyptic number.

It is an amenable number.

243811641 is a deficient number, since it is larger than the sum of its proper divisors (81270551).

243811641 is an equidigital number, since it uses as much as digits as its factorization.

243811641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81270550.

The product of its digits is 4608, while the sum is 30.

The square root of 243811641 is about 15614.4689631124. The cubic root of 243811641 is about 624.7191407945.

Adding to 243811641 its reverse (146118342), we get a palindrome (389929983).

The spelling of 243811641 in words is "two hundred forty-three million, eight hundred eleven thousand, six hundred forty-one".