205203155191 has 2 divisors, whose sum is σ = 205203155192. Its totient is φ = 205203155190.

The previous prime is 205203155173. The next prime is 205203155281. The reversal of 205203155191 is 191551302502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205203155191 - 2³⁵ = 170843416823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205203155141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102601577595 + 102601577596.

It is an arithmetic number, because the mean of its divisors is an integer number (102601577596).

Almost surely, 2^205203155191 is an apocalyptic number.

205203155191 is a deficient number, since it is larger than the sum of its proper divisors (1).

205203155191 is an equidigital number, since it uses as much as digits as its factorization.

205203155191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 34.

Adding to 205203155191 its reverse (191551302502), we get a palindrome (396754457693).

The spelling of 205203155191 in words is "two hundred five billion, two hundred three million, one hundred fifty-five thousand, one hundred ninety-one".