243989159391 has 16 divisors (see below), whose sum is σ = 362965287520. Its totient is φ = 161984499840.

The previous prime is 243989159389. The next prime is 243989159411. The reversal of 243989159391 is 193951989342.

243989159391 is a `hidden beast` number, since 2 + 4 + 3 + 98 + 9 + 159 + 391 = 666.

It is not a de Polignac number, because 243989159391 - 2¹ = 243989159389 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 (243989159321) 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, 18741700 + ... + 18754713.

It is an arithmetic number, because the mean of its divisors is an integer number (22685330470).

Almost surely, 2^243989159391 is an apocalyptic number.

243989159391 is a deficient number, since it is larger than the sum of its proper divisors (118976128129).

243989159391 is a wasteful number, since it uses less digits than its factorization.

243989159391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37496663 (or 37496657 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The spelling of 243989159391 in words is "two hundred forty-three billion, nine hundred eighty-nine million, one hundred fifty-nine thousand, three hundred ninety-one".