243378535 has 4 divisors (see below), whose sum is σ = 292054248. Its totient is φ = 194702824.

The previous prime is 243378449. The next prime is 243378547. The reversal of 243378535 is 535873342.

243378535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 243378535 - 2¹³ = 243370343 is a prime.

It is a super-2 number, since 2×243378535² = 118466222597492450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24337849 + ... + 24337858.

It is an arithmetic number, because the mean of its divisors is an integer number (73013562).

Almost surely, 2^243378535 is an apocalyptic number.

243378535 is a deficient number, since it is larger than the sum of its proper divisors (48675713).

243378535 is an equidigital number, since it uses as much as digits as its factorization.

243378535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48675712.

The product of its digits is 302400, while the sum is 40.

The square root of 243378535 is about 15600.5940592017. The cubic root of 243378535 is about 624.3490053650.

The spelling of 243378535 in words is "two hundred forty-three million, three hundred seventy-eight thousand, five hundred thirty-five".