243378581 has 8 divisors (see below), whose sum is σ = 262146720. Its totient is φ = 225206352.

The previous prime is 243378559. The next prime is 243378607. The reversal of 243378581 is 185873342.

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

It is a cyclic number.

It is not a de Polignac number, because 243378581 - 2¹⁰ = 243377557 is a prime.

It is a super-2 number, since 2×243378581² = 118466267379147122, which contains 22 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 (243378181) 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, 148130 + ... + 149763.

It is an arithmetic number, because the mean of its divisors is an integer number (32768340).

Almost surely, 2^243378581 is an apocalyptic number.

It is an amenable number.

243378581 is a deficient number, since it is larger than the sum of its proper divisors (18768139).

243378581 is a wasteful number, since it uses less digits than its factorization.

243378581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297955.

The product of its digits is 161280, while the sum is 41.

The square root of 243378581 is about 15600.5955335045. The cubic root of 243378581 is about 624.3490447002.

The spelling of 243378581 in words is "two hundred forty-three million, three hundred seventy-eight thousand, five hundred eighty-one".