243916488091 has 4 divisors (see below), whose sum is σ = 245377066032. Its totient is φ = 242455910152.

The previous prime is 243916488059. The next prime is 243916488113. The reversal of 243916488091 is 190884619342.

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 243916488091 - 2⁵ = 243916488059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243916488041) 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, 730288720 + ... + 730289053.

It is an arithmetic number, because the mean of its divisors is an integer number (61344266508).

Almost surely, 2^243916488091 is an apocalyptic number.

243916488091 is a deficient number, since it is larger than the sum of its proper divisors (1460577941).

243916488091 is a wasteful number, since it uses less digits than its factorization.

243916488091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460577940.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 243916488091 in words is "two hundred forty-three billion, nine hundred sixteen million, four hundred eighty-eight thousand, ninety-one".