243540413 has 4 divisors (see below), whose sum is σ = 243639168. Its totient is φ = 243441660.

The previous prime is 243540403. The next prime is 243540439. The reversal of 243540413 is 314045342.

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 243540413 - 2²⁴ = 226763197 is a prime.

It is a super-3 number, since 3×243540413³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540403) 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 3 ways as a sum of consecutive naturals, for example, 45581 + ... + 50642.

It is an arithmetic number, because the mean of its divisors is an integer number (60909792).

Almost surely, 2^243540413 is an apocalyptic number.

It is an amenable number.

243540413 is a deficient number, since it is larger than the sum of its proper divisors (98755).

243540413 is an equidigital number, since it uses as much as digits as its factorization.

243540413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98754.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 243540413 is about 15605.7813966491. The cubic root of 243540413 is about 624.4873987923.

Adding to 243540413 its reverse (314045342), we get a palindrome (557585755).

The spelling of 243540413 in words is "two hundred forty-three million, five hundred forty thousand, four hundred thirteen".