243155011309 has 4 divisors (see below), whose sum is σ = 277891441504. Its totient is φ = 208418581116.

The previous prime is 243155011261. The next prime is 243155011339. The reversal of 243155011309 is 903110551342.

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.

It is a cyclic number.

It is not a de Polignac number, because 243155011309 - 2¹¹ = 243155009261 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 (243155011339) 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, 17368215087 + ... + 17368215100.

It is an arithmetic number, because the mean of its divisors is an integer number (69472860376).

Almost surely, 2^243155011309 is an apocalyptic number.

It is an amenable number.

243155011309 is a deficient number, since it is larger than the sum of its proper divisors (34736430195).

243155011309 is an equidigital number, since it uses as much as digits as its factorization.

243155011309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34736430194.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 243155011309 in words is "two hundred forty-three billion, one hundred fifty-five million, eleven thousand, three hundred nine".