205144451 has 2 divisors, whose sum is σ = 205144452. Its totient is φ = 205144450.

The previous prime is 205144441. The next prime is 205144469. The reversal of 205144451 is 154441502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205144451 - 2¹⁴ = 205128067 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205144451.

It is not a weakly prime, because it can be changed into another prime (205144411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102572225 + 102572226.

It is an arithmetic number, because the mean of its divisors is an integer number (102572226).

Almost surely, 2^205144451 is an apocalyptic number.

205144451 is a deficient number, since it is larger than the sum of its proper divisors (1).

205144451 is an equidigital number, since it uses as much as digits as its factorization.

205144451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 205144451 is about 14322.8646226933. The cubic root of 205144451 is about 589.7753151929.

Adding to 205144451 its reverse (154441502), we get a palindrome (359585953).

The spelling of 205144451 in words is "two hundred five million, one hundred forty-four thousand, four hundred fifty-one".