243140641 has 4 divisors (see below), whose sum is σ = 243175300. Its totient is φ = 243105984.

The previous prime is 243140617. The next prime is 243140671. The reversal of 243140641 is 146041342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27667600 + 215473041 = 5260^2 + 14679^2 .

It is a cyclic number.

It is not a de Polignac number, because 243140641 - 2⁵ = 243140609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243140671) 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, 2676 + ... + 22213.

It is an arithmetic number, because the mean of its divisors is an integer number (60793825).

Almost surely, 2^243140641 is an apocalyptic number.

It is an amenable number.

243140641 is a deficient number, since it is larger than the sum of its proper divisors (34659).

243140641 is an equidigital number, since it uses as much as digits as its factorization.

243140641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34658.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 243140641 is about 15592.9676777706. The cubic root of 243140641 is about 624.1455126145.

Adding to 243140641 its reverse (146041342), we get a palindrome (389181983).

The spelling of 243140641 in words is "two hundred forty-three million, one hundred forty thousand, six hundred forty-one".