243562481 has 4 divisors (see below), whose sum is σ = 243593700. Its totient is φ = 243531264.

The previous prime is 243562471. The next prime is 243562483. The reversal of 243562481 is 184265342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36663025 + 206899456 = 6055^2 + 14384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243562481 is a prime.

It is a super-2 number, since 2×243562481² = 118645364301750722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243562483) 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, 7385 + ... + 23273.

It is an arithmetic number, because the mean of its divisors is an integer number (60898425).

Almost surely, 2^243562481 is an apocalyptic number.

It is an amenable number.

243562481 is a deficient number, since it is larger than the sum of its proper divisors (31219).

243562481 is a wasteful number, since it uses less digits than its factorization.

243562481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31218.

The product of its digits is 46080, while the sum is 35.

The square root of 243562481 is about 15606.4884262924. The cubic root of 243562481 is about 624.5062605101.

The spelling of 243562481 in words is "two hundred forty-three million, five hundred sixty-two thousand, four hundred eighty-one".