205022491 has 2 divisors, whose sum is σ = 205022492. Its totient is φ = 205022490.

The previous prime is 205022453. The next prime is 205022537. The reversal of 205022491 is 194220502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205022491 is a prime.

It is equal to p_11341627 and since 205022491 and 11341627 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (205029491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102511245 + 102511246.

It is an arithmetic number, because the mean of its divisors is an integer number (102511246).

Almost surely, 2^205022491 is an apocalyptic number.

205022491 is a deficient number, since it is larger than the sum of its proper divisors (1).

205022491 is an equidigital number, since it uses as much as digits as its factorization.

205022491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 205022491 is about 14318.6064615241. The cubic root of 205022491 is about 589.6584166597.

Adding to 205022491 its reverse (194220502), we get a palindrome (399242993).

The spelling of 205022491 in words is "two hundred five million, twenty-two thousand, four hundred ninety-one".