243113122551 has 16 divisors (see below), whose sum is σ = 351035717760. Its totient is φ = 148772271840.

The previous prime is 243113122523. The next prime is 243113122559. The reversal of 243113122551 is 155221311342.

It is a happy number.

It is not a de Polignac number, because 243113122551 - 2¹⁵ = 243113089783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243113122559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17405505 + ... + 17419466.

It is an arithmetic number, because the mean of its divisors is an integer number (21939732360).

Almost surely, 2^243113122551 is an apocalyptic number.

243113122551 is a deficient number, since it is larger than the sum of its proper divisors (107922595209).

243113122551 is a wasteful number, since it uses less digits than its factorization.

243113122551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34825166.

The product of its digits is 7200, while the sum is 30.

Adding to 243113122551 its reverse (155221311342), we get a palindrome (398334433893).

The spelling of 243113122551 in words is "two hundred forty-three billion, one hundred thirteen million, one hundred twenty-two thousand, five hundred fifty-one".