243989291 has 8 divisors (see below), whose sum is σ = 300294624. Its totient is φ = 193046400.

The previous prime is 243989281. The next prime is 243989303. The reversal of 243989291 is 192989342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243989291 - 2⁶ = 243989227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243989201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1340510 + ... + 1340691.

It is an arithmetic number, because the mean of its divisors is an integer number (37536828).

Almost surely, 2^243989291 is an apocalyptic number.

243989291 is a deficient number, since it is larger than the sum of its proper divisors (56305333).

243989291 is a wasteful number, since it uses less digits than its factorization.

243989291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681221.

The product of its digits is 279936, while the sum is 47.

The square root of 243989291 is about 15620.1565613153. The cubic root of 243989291 is about 624.8708349614.

The spelling of 243989291 in words is "two hundred forty-three million, nine hundred eighty-nine thousand, two hundred ninety-one".