243213172 has 12 divisors (see below), whose sum is σ = 426125700. Its totient is φ = 121462976.

The previous prime is 243213143. The next prime is 243213181. The reversal of 243213172 is 271312342.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 205807716 + 37405456 = 14346^2 + 6116^2 .

It is a congruent number.

It is an unprimeable number.

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, 32047 + ... + 38902.

It is an arithmetic number, because the mean of its divisors is an integer number (35510475).

Almost surely, 2^243213172 is an apocalyptic number.

It is an amenable number.

243213172 is a deficient number, since it is larger than the sum of its proper divisors (182912528).

243213172 is a wasteful number, since it uses less digits than its factorization.

243213172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71810 (or 71808 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 243213172 is about 15595.2932643154. The cubic root of 243213172 is about 624.2075691500.

The spelling of 243213172 in words is "two hundred forty-three million, two hundred thirteen thousand, one hundred seventy-two".