243771440431 has 4 divisors (see below), whose sum is σ = 252177352200. Its totient is φ = 235365528664.

The previous prime is 243771440389. The next prime is 243771440441. The reversal of 243771440431 is 134044177342.

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 243771440431 - 2²³ = 243763051823 is a prime.

It is a super-2 number, since 2×243771440431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243771440441) 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, 4202955841 + ... + 4202955898.

It is an arithmetic number, because the mean of its divisors is an integer number (63044338050).

Almost surely, 2^243771440431 is an apocalyptic number.

243771440431 is a deficient number, since it is larger than the sum of its proper divisors (8405911769).

243771440431 is an equidigital number, since it uses as much as digits as its factorization.

243771440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8405911768.

The product of its (nonzero) digits is 225792, while the sum is 40.

The spelling of 243771440431 in words is "two hundred forty-three billion, seven hundred seventy-one million, four hundred forty thousand, four hundred thirty-one".