243251312 has 20 divisors (see below), whose sum is σ = 491791440. Its totient is φ = 116337408.

The previous prime is 243251311. The next prime is 243251353. The reversal of 243251312 is 213152342.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243251311) 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 3 ways as a sum of consecutive naturals, for example, 330137 + ... + 330872.

It is an arithmetic number, because the mean of its divisors is an integer number (24589572).

Almost surely, 2^243251312 is an apocalyptic number.

It is an amenable number.

243251312 is an abundant number, since it is smaller than the sum of its proper divisors (248540128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243251312 is a wasteful number, since it uses less digits than its factorization.

243251312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661040 (or 661034 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 243251312 is about 15596.5160212145. The cubic root of 243251312 is about 624.2401962649.

The spelling of 243251312 in words is "two hundred forty-three million, two hundred fifty-one thousand, three hundred twelve".