205609950331 has 2 divisors, whose sum is σ = 205609950332. Its totient is φ = 205609950330.

The previous prime is 205609950307. The next prime is 205609950389. The reversal of 205609950331 is 133059906502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205609950331 - 2⁹ = 205609949819 is a prime.

It is a super-2 number, since 2×205609950331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205609950731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102804975165 + 102804975166.

It is an arithmetic number, because the mean of its divisors is an integer number (102804975166).

Almost surely, 2^205609950331 is an apocalyptic number.

205609950331 is a deficient number, since it is larger than the sum of its proper divisors (1).

205609950331 is an equidigital number, since it uses as much as digits as its factorization.

205609950331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 43.

The spelling of 205609950331 in words is "two hundred five billion, six hundred nine million, nine hundred fifty thousand, three hundred thirty-one".