243897834891 has 8 divisors (see below), whose sum is σ = 325836009360. Its totient is φ = 162279108512.

The previous prime is 243897834833. The next prime is 243897834953. The reversal of 243897834891 is 198438798342.

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 243897834891 - 2¹⁰ = 243897833867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243897834811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79860240 + ... + 79863293.

It is an arithmetic number, because the mean of its divisors is an integer number (40729501170).

Almost surely, 2^243897834891 is an apocalyptic number.

243897834891 is a deficient number, since it is larger than the sum of its proper divisors (81938174469).

243897834891 is a wasteful number, since it uses less digits than its factorization.

243897834891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159724045.

The product of its digits is 83607552, while the sum is 66.

The spelling of 243897834891 in words is "two hundred forty-three billion, eight hundred ninety-seven million, eight hundred thirty-four thousand, eight hundred ninety-one".