205403057 has 2 divisors, whose sum is σ = 205403058. Its totient is φ = 205403056.

The previous prime is 205402991. The next prime is 205403101. The reversal of 205403057 is 750304502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165662641 + 39740416 = 12871^2 + 6304^2 .

It is a cyclic number.

It is not a de Polignac number, because 205403057 - 2¹⁰ = 205402033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205403657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102701528 + 102701529.

It is an arithmetic number, because the mean of its divisors is an integer number (102701529).

Almost surely, 2^205403057 is an apocalyptic number.

It is an amenable number.

205403057 is a deficient number, since it is larger than the sum of its proper divisors (1).

205403057 is an equidigital number, since it uses as much as digits as its factorization.

205403057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 205403057 is about 14331.8895125521. The cubic root of 205403057 is about 590.0230355844.

Adding to 205403057 its reverse (750304502), we get a palindrome (955707559).

The spelling of 205403057 in words is "two hundred five million, four hundred three thousand, fifty-seven".