204631431553 has 2 divisors, whose sum is σ = 204631431554. Its totient is φ = 204631431552.

The previous prime is 204631431509. The next prime is 204631431583. The reversal of 204631431553 is 355134136402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203985915904 + 645515649 = 451648^2 + 25407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204631431553 is a prime.

It is not a weakly prime, because it can be changed into another prime (204631431583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102315715776 + 102315715777.

It is an arithmetic number, because the mean of its divisors is an integer number (102315715777).

Almost surely, 2^204631431553 is an apocalyptic number.

It is an amenable number.

204631431553 is a deficient number, since it is larger than the sum of its proper divisors (1).

204631431553 is an equidigital number, since it uses as much as digits as its factorization.

204631431553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 204631431553 its reverse (355134136402), we get a palindrome (559765567955).

The spelling of 204631431553 in words is "two hundred four billion, six hundred thirty-one million, four hundred thirty-one thousand, five hundred fifty-three".