243097881 has 24 divisors (see below), whose sum is σ = 360495360. Its totient is φ = 145544256.

The previous prime is 243097873. The next prime is 243097903. The reversal of 243097881 is 188790342.

It is not a de Polignac number, because 243097881 - 2³ = 243097873 is a prime.

It is a super-2 number, since 2×243097881² = 118193159493380322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243097861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12280 + ... + 25238.

It is an arithmetic number, because the mean of its divisors is an integer number (15020640).

Almost surely, 2^243097881 is an apocalyptic number.

It is an amenable number.

243097881 is a deficient number, since it is larger than the sum of its proper divisors (117397479).

243097881 is a wasteful number, since it uses less digits than its factorization.

243097881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13025 (or 13012 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 243097881 is about 15591.5964865693. The cubic root of 243097881 is about 624.1089219583.

The spelling of 243097881 in words is "two hundred forty-three million, ninety-seven thousand, eight hundred eighty-one".