243413551 has 4 divisors (see below), whose sum is σ = 245688552. Its totient is φ = 241138552.

The previous prime is 243413549. The next prime is 243413557. The reversal of 243413551 is 155314342.

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 243413551 - 2¹ = 243413549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243413557) 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, 1137340 + ... + 1137553.

It is an arithmetic number, because the mean of its divisors is an integer number (61422138).

Almost surely, 2^243413551 is an apocalyptic number.

243413551 is a deficient number, since it is larger than the sum of its proper divisors (2275001).

243413551 is a wasteful number, since it uses less digits than its factorization.

243413551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275000.

The product of its digits is 7200, while the sum is 28.

The square root of 243413551 is about 15601.7162837939. The cubic root of 243413551 is about 624.3789465927.

Adding to 243413551 its reverse (155314342), we get a palindrome (398727893).

The spelling of 243413551 in words is "two hundred forty-three million, four hundred thirteen thousand, five hundred fifty-one".