243134342551 has 4 divisors (see below), whose sum is σ = 243155516400. Its totient is φ = 243113168704.

The previous prime is 243134342531. The next prime is 243134342587. The reversal of 243134342551 is 155243431342.

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 243134342551 - 2²³ = 243125953943 is a prime.

It is a super-2 number, since 2×243134342551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243134342551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243134342501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10569691 + ... + 10592668.

It is an arithmetic number, because the mean of its divisors is an integer number (60788879100).

Almost surely, 2^243134342551 is an apocalyptic number.

243134342551 is a deficient number, since it is larger than the sum of its proper divisors (21173849).

243134342551 is a wasteful number, since it uses less digits than its factorization.

243134342551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21173848.

The product of its digits is 172800, while the sum is 37.

Adding to 243134342551 its reverse (155243431342), we get a palindrome (398377773893).

The spelling of 243134342551 in words is "two hundred forty-three billion, one hundred thirty-four million, three hundred forty-two thousand, five hundred fifty-one".