243555534204131 has 4 divisors (see below), whose sum is σ = 245831754150072. Its totient is φ = 241279314258192.

The previous prime is 243555534204049. The next prime is 243555534204133. The reversal of 243555534204131 is 131402435555342.

243555534204131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243555534204131 is a prime.

It is a super-2 number, since 2×243555534204131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243555534204133) 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, 1138109972810 + ... + 1138109973023.

It is an arithmetic number, because the mean of its divisors is an integer number (61457938537518).

Almost surely, 2^{243555534204131} is an apocalyptic number.

243555534204131 is a deficient number, since it is larger than the sum of its proper divisors (2276219945941).

243555534204131 is a wasteful number, since it uses less digits than its factorization.

243555534204131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276219945940.

The product of its (nonzero) digits is 4320000, while the sum is 47.

Adding to 243555534204131 its reverse (131402435555342), we get a palindrome (374957969759473).

The spelling of 243555534204131 in words is "two hundred forty-three trillion, five hundred fifty-five billion, five hundred thirty-four million, two hundred four thousand, one hundred thirty-one".