243545551 has 8 divisors (see below), whose sum is σ = 255153024. Its totient is φ = 232023000.

The previous prime is 243545543. The next prime is 243545557. The reversal of 243545551 is 155545342.

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 243545551 - 2³ = 243545543 is a prime.

It is a super-3 number, since 3×243545551³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243545557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15321 + ... + 26866.

It is an arithmetic number, because the mean of its divisors is an integer number (31894128).

Almost surely, 2^243545551 is an apocalyptic number.

243545551 is a deficient number, since it is larger than the sum of its proper divisors (11607473).

243545551 is a wasteful number, since it uses less digits than its factorization.

243545551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42461.

The product of its digits is 60000, while the sum is 34.

The square root of 243545551 is about 15605.9460142601. The cubic root of 243545551 is about 624.4917903888.

The spelling of 243545551 in words is "two hundred forty-three million, five hundred forty-five thousand, five hundred fifty-one".