205350391 has 2 divisors, whose sum is σ = 205350392. Its totient is φ = 205350390.

The previous prime is 205350359. The next prime is 205350401. The reversal of 205350391 is 193053502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205350391 - 2⁵ = 205350359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205350091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102675195 + 102675196.

It is an arithmetic number, because the mean of its divisors is an integer number (102675196).

Almost surely, 2^205350391 is an apocalyptic number.

205350391 is a deficient number, since it is larger than the sum of its proper divisors (1).

205350391 is an equidigital number, since it uses as much as digits as its factorization.

205350391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 205350391 is about 14330.0520236320. The cubic root of 205350391 is about 589.9726033434.

The spelling of 205350391 in words is "two hundred five million, three hundred fifty thousand, three hundred ninety-one".