204131134397 has 2 divisors, whose sum is σ = 204131134398. Its totient is φ = 204131134396.

The previous prime is 204131134391. The next prime is 204131134453. The reversal of 204131134397 is 793431131402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186404608516 + 17726525881 = 431746^2 + 133141^2 .

It is a cyclic number.

It is not a de Polignac number, because 204131134397 - 2¹⁰ = 204131133373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204131134397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204131134391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102065567198 + 102065567199.

It is an arithmetic number, because the mean of its divisors is an integer number (102065567199).

Almost surely, 2^204131134397 is an apocalyptic number.

It is an amenable number.

204131134397 is a deficient number, since it is larger than the sum of its proper divisors (1).

204131134397 is an equidigital number, since it uses as much as digits as its factorization.

204131134397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

Adding to 204131134397 its reverse (793431131402), we get a palindrome (997562265799).

The spelling of 204131134397 in words is "two hundred four billion, one hundred thirty-one million, one hundred thirty-four thousand, three hundred ninety-seven".