243598981 has 8 divisors (see below), whose sum is σ = 256573280. Its totient is φ = 230640048.

The previous prime is 243598973. The next prime is 243599053. The reversal of 243598981 is 189895342.

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 243598981 - 2³ = 243598973 is a prime.

It is a super-2 number, since 2×243598981² = 118680927088476722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243598931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44275 + ... + 49471.

It is an arithmetic number, because the mean of its divisors is an integer number (32071660).

Almost surely, 2^243598981 is an apocalyptic number.

It is an amenable number.

243598981 is a deficient number, since it is larger than the sum of its proper divisors (12974299).

243598981 is a wasteful number, since it uses less digits than its factorization.

243598981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7683.

The product of its digits is 622080, while the sum is 49.

The square root of 243598981 is about 15607.6577679035. The cubic root of 243598981 is about 624.5374548877.

The spelling of 243598981 in words is "two hundred forty-three million, five hundred ninety-eight thousand, nine hundred eighty-one".