243561264371 has 4 divisors (see below), whose sum is σ = 244259148000. Its totient is φ = 242863380744.

The previous prime is 243561264343. The next prime is 243561264377. The reversal of 243561264371 is 173462165342.

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 243561264371 - 2¹⁰ = 243561263347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243561264377) 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, 348941291 + ... + 348941988.

It is an arithmetic number, because the mean of its divisors is an integer number (61064787000).

Almost surely, 2^243561264371 is an apocalyptic number.

243561264371 is a deficient number, since it is larger than the sum of its proper divisors (697883629).

243561264371 is an equidigital number, since it uses as much as digits as its factorization.

243561264371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697883628.

The product of its digits is 725760, while the sum is 44.

The spelling of 243561264371 in words is "two hundred forty-three billion, five hundred sixty-one million, two hundred sixty-four thousand, three hundred seventy-one".