205632491 has 2 divisors, whose sum is σ = 205632492. Its totient is φ = 205632490.

The previous prime is 205632481. The next prime is 205632529. The reversal of 205632491 is 194236502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205632491 is a prime.

It is not a weakly prime, because it can be changed into another prime (205632451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102816245 + 102816246.

It is an arithmetic number, because the mean of its divisors is an integer number (102816246).

Almost surely, 2^205632491 is an apocalyptic number.

205632491 is a deficient number, since it is larger than the sum of its proper divisors (1).

205632491 is an equidigital number, since it uses as much as digits as its factorization.

205632491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 205632491 is about 14339.8915965219. The cubic root of 205632491 is about 590.2426379203.

Adding to 205632491 its reverse (194236502), we get a palindrome (399868993).

The spelling of 205632491 in words is "two hundred five million, six hundred thirty-two thousand, four hundred ninety-one".