205464521 has 2 divisors, whose sum is σ = 205464522. Its totient is φ = 205464520.

The previous prime is 205464481. The next prime is 205464529. The reversal of 205464521 is 125464502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 8202496 = 14045^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 205464521 - 2¹⁴ = 205448137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205464529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102732260 + 102732261.

It is an arithmetic number, because the mean of its divisors is an integer number (102732261).

Almost surely, 2^205464521 is an apocalyptic number.

It is an amenable number.

205464521 is a deficient number, since it is larger than the sum of its proper divisors (1).

205464521 is an equidigital number, since it uses as much as digits as its factorization.

205464521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 205464521 is about 14334.0336611855. The cubic root of 205464521 is about 590.0818817699.

The spelling of 205464521 in words is "two hundred five million, four hundred sixty-four thousand, five hundred twenty-one".