243955012871 has 4 divisors (see below), whose sum is σ = 244324083144. Its totient is φ = 243585942600.

The previous prime is 243955012853. The next prime is 243955012879. The reversal of 243955012871 is 178210559342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178210559342 = 2 ⋅89105279671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243955012871 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 (243955012879) 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, 184534145 + ... + 184535466.

It is an arithmetic number, because the mean of its divisors is an integer number (61081020786).

Almost surely, 2^243955012871 is an apocalyptic number.

243955012871 is a deficient number, since it is larger than the sum of its proper divisors (369070273).

243955012871 is an equidigital number, since it uses as much as digits as its factorization.

243955012871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369070272.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 243955012871 in words is "two hundred forty-three billion, nine hundred fifty-five million, twelve thousand, eight hundred seventy-one".