243031987 has 8 divisors (see below), whose sum is σ = 266107392. Its totient is φ = 220120200.

The previous prime is 243031979. The next prime is 243032047. The reversal of 243031987 is 789130342.

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 243031987 - 2³ = 243031979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243031787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37783 + ... + 43744.

It is an arithmetic number, because the mean of its divisors is an integer number (33263424).

Almost surely, 2^243031987 is an apocalyptic number.

243031987 is a deficient number, since it is larger than the sum of its proper divisors (23075405).

243031987 is a wasteful number, since it uses less digits than its factorization.

243031987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81809.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 243031987 is about 15589.4832178620. The cubic root of 243031987 is about 624.0525266366.

The spelling of 243031987 in words is "two hundred forty-three million, thirty-one thousand, nine hundred eighty-seven".