243331047 has 20 divisors (see below), whose sum is σ = 384878736. Its totient is φ = 152677440.

The previous prime is 243330991. The next prime is 243331087. The reversal of 243331047 is 740133342.

It is not a de Polignac number, because 243331047 - 2¹⁰ = 243330023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 243331047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243331087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 86979 + ... + 89732.

Almost surely, 2^243331047 is an apocalyptic number.

243331047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

243331047 is a deficient number, since it is larger than the sum of its proper divisors (141547689).

243331047 is a wasteful number, since it uses less digits than its factorization.

243331047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176740 (or 176731 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 243331047 is about 15599.0719916282. The cubic root of 243331047 is about 624.3083950812.

Adding to 243331047 its reverse (740133342), we get a palindrome (983464389).

The spelling of 243331047 in words is "two hundred forty-three million, three hundred thirty-one thousand, forty-seven".