243261656 has 32 divisors (see below), whose sum is σ = 505748880. Its totient is φ = 108758400.

The previous prime is 243261649. The next prime is 243261709. The reversal of 243261656 is 656162342.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 17291 + ... + 28026.

Almost surely, 2^243261656 is an apocalyptic number.

It is an amenable number.

243261656 is an abundant number, since it is smaller than the sum of its proper divisors (262487224).

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

243261656 is a wasteful number, since it uses less digits than its factorization.

243261656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45395 (or 45391 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 243261656 is about 15596.8476302104. The cubic root of 243261656 is about 624.2490445201.

The spelling of 243261656 in words is "two hundred forty-three million, two hundred sixty-one thousand, six hundred fifty-six".