243943597 has 4 divisors (see below), whose sum is σ = 244114560. Its totient is φ = 243772636.

The previous prime is 243943573. The next prime is 243943613. The reversal of 243943597 is 795349342.

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: 795349342 = 2 ⋅397674671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243943597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243943537) 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, 83323 + ... + 86200.

It is an arithmetic number, because the mean of its divisors is an integer number (61028640).

Almost surely, 2^243943597 is an apocalyptic number.

It is an amenable number.

243943597 is a deficient number, since it is larger than the sum of its proper divisors (170963).

243943597 is a wasteful number, since it uses less digits than its factorization.

243943597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170962.

The product of its digits is 816480, while the sum is 46.

The square root of 243943597 is about 15618.6938314316. The cubic root of 243943597 is about 624.8318241911.

The spelling of 243943597 in words is "two hundred forty-three million, nine hundred forty-three thousand, five hundred ninety-seven".