243101331553 has 4 divisors (see below), whose sum is σ = 253670954688. Its totient is φ = 232531708420.

The previous prime is 243101331541. The next prime is 243101331569. The reversal of 243101331553 is 355133101342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243101331553 - 2⁹ = 243101331041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243101331533) 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, 5284811533 + ... + 5284811578.

It is an arithmetic number, because the mean of its divisors is an integer number (63417738672).

Almost surely, 2^243101331553 is an apocalyptic number.

243101331553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

243101331553 is a deficient number, since it is larger than the sum of its proper divisors (10569623135).

243101331553 is a wasteful number, since it uses less digits than its factorization.

243101331553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10569623134.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 243101331553 its reverse (355133101342), we get a palindrome (598234432895).

The spelling of 243101331553 in words is "two hundred forty-three billion, one hundred one million, three hundred thirty-one thousand, five hundred fifty-three".