243396711891 has 16 divisors (see below), whose sum is σ = 366498997920. Its totient is φ = 159604400160.

The previous prime is 243396711889. The next prime is 243396711937. The reversal of 243396711891 is 198117693342.

243396711891 is a `hidden beast` number, since 2 + 4 + 3 + 396 + 71 + 189 + 1 = 666.

It is not a de Polignac number, because 243396711891 - 2¹ = 243396711889 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (243396711881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73889280 + ... + 73892573.

It is an arithmetic number, because the mean of its divisors is an integer number (22906187370).

Almost surely, 2^243396711891 is an apocalyptic number.

243396711891 is a deficient number, since it is larger than the sum of its proper divisors (123102286029).

243396711891 is a wasteful number, since it uses less digits than its factorization.

243396711891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147781923 (or 147781917 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 243396711891 in words is "two hundred forty-three billion, three hundred ninety-six million, seven hundred eleven thousand, eight hundred ninety-one".