243452551 has 4 divisors (see below), whose sum is σ = 245816272. Its totient is φ = 241088832.

The previous prime is 243452543. The next prime is 243452609. The reversal of 243452551 is 155254342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243452551 - 2³ = 243452543 is a prime.

It is a super-3 number, since 3×243452551³ (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 (243452501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181706 + ... + 1181911.

It is an arithmetic number, because the mean of its divisors is an integer number (61454068).

Almost surely, 2^243452551 is an apocalyptic number.

243452551 is a deficient number, since it is larger than the sum of its proper divisors (2363721).

243452551 is a wasteful number, since it uses less digits than its factorization.

243452551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363720.

The product of its digits is 24000, while the sum is 31.

The square root of 243452551 is about 15602.9660962267. The cubic root of 243452551 is about 624.4122910503.

It can be divided in two parts, 24345 and 2551, that added together give a square (26896 = 164²).

The spelling of 243452551 in words is "two hundred forty-three million, four hundred fifty-two thousand, five hundred fifty-one".