243656041 has 4 divisors (see below), whose sum is σ = 243712000. Its totient is φ = 243600084.

The previous prime is 243656011. The next prime is 243656047. The reversal of 243656041 is 140656342.

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, and also an emirpimes, since its reverse is a distinct semiprime: 140656342 = 2 ⋅70328171.

It is a cyclic number.

It is not a de Polignac number, because 243656041 - 2¹⁵ = 243623273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243655994 and 243656012.

It is not an unprimeable number, because it can be changed into a prime (243656047) 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, 20841 + ... + 30358.

It is an arithmetic number, because the mean of its divisors is an integer number (60928000).

Almost surely, 2^243656041 is an apocalyptic number.

It is an amenable number.

243656041 is a deficient number, since it is larger than the sum of its proper divisors (55959).

243656041 is an equidigital number, since it uses as much as digits as its factorization.

243656041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55958.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 243656041 is about 15609.4856097182. The cubic root of 243656041 is about 624.5862144309.

The spelling of 243656041 in words is "two hundred forty-three million, six hundred fifty-six thousand, forty-one".