243193963609 has 3 divisors (see below), whose sum is σ = 243194456757. Its totient is φ = 243193470462.

The previous prime is 243193963591. The next prime is 243193963619. The reversal of 243193963609 is 906369391342.

The square root of 243193963609 is 493147.

It is a perfect power (a square), and thus also a powerful number.

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 is a de Polignac number, because none of the positive numbers 2^k-243193963609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243193963609.

It is not an unprimeable number, because it can be changed into a prime (243193963619) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 246574 + ... + 739720.

It is an arithmetic number, because the mean of its divisors is an integer number (81064818919).

Almost surely, 2^243193963609 is an apocalyptic number.

243193963609 is the 493147-th square number.

243193963609 is the 246574-th centered octagonal number.

It is an amenable number.

243193963609 is a deficient number, since it is larger than the sum of its proper divisors (493148).

243193963609 is an frugal number, since it uses more digits than its factorization.

243193963609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986294 (or 493147 counting only the distinct ones).

The product of its (nonzero) digits is 5668704, while the sum is 55.

The spelling of 243193963609 in words is "two hundred forty-three billion, one hundred ninety-three million, nine hundred sixty-three thousand, six hundred nine".