243831641 has 8 divisors (see below), whose sum is σ = 250253064. Its totient is φ = 237477760.

The previous prime is 243831631. The next prime is 243831649. The reversal of 243831641 is 146138342.

It can be written as a sum of positive squares in 4 ways, for example, as 8976016 + 234855625 = 2996^2 + 15325^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243831641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243831598 and 243831607.

It is not an unprimeable number, because it can be changed into a prime (243831649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9530 + ... + 24051.

It is an arithmetic number, because the mean of its divisors is an integer number (31281633).

Almost surely, 2^243831641 is an apocalyptic number.

It is an amenable number.

243831641 is a deficient number, since it is larger than the sum of its proper divisors (6421423).

243831641 is a wasteful number, since it uses less digits than its factorization.

243831641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33771.

The product of its digits is 13824, while the sum is 32.

The square root of 243831641 is about 15615.1093816214. The cubic root of 243831641 is about 624.7362223432.

Adding to 243831641 its reverse (146138342), we get a palindrome (389969983).

The spelling of 243831641 in words is "two hundred forty-three million, eight hundred thirty-one thousand, six hundred forty-one".