205136443 has 2 divisors, whose sum is σ = 205136444. Its totient is φ = 205136442.

The previous prime is 205136429. The next prime is 205136567. The reversal of 205136443 is 344631502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205136443 - 2⁵ = 205136411 is a prime.

It is not a weakly prime, because it can be changed into another prime (205136413) 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, 102568221 + 102568222.

It is an arithmetic number, because the mean of its divisors is an integer number (102568222).

Almost surely, 2^205136443 is an apocalyptic number.

205136443 is a deficient number, since it is larger than the sum of its proper divisors (1).

205136443 is an equidigital number, since it uses as much as digits as its factorization.

205136443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 205136443 is about 14322.5850669493. The cubic root of 205136443 is about 589.7676409547.

Adding to 205136443 its reverse (344631502), we get a palindrome (549767945).

The spelling of 205136443 in words is "two hundred five million, one hundred thirty-six thousand, four hundred forty-three".