205445057 has 2 divisors, whose sum is σ = 205445058. Its totient is φ = 205445056.

The previous prime is 205445047. The next prime is 205445059. The reversal of 205445057 is 750544502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173080336 + 32364721 = 13156^2 + 5689^2 .

It is a cyclic number.

It is not a de Polignac number, because 205445057 - 2⁴ = 205445041 is a prime.

Together with 205445059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205445059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102722528 + 102722529.

It is an arithmetic number, because the mean of its divisors is an integer number (102722529).

Almost surely, 2^205445057 is an apocalyptic number.

It is an amenable number.

205445057 is a deficient number, since it is larger than the sum of its proper divisors (1).

205445057 is an equidigital number, since it uses as much as digits as its factorization.

205445057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 205445057 is about 14333.3547015345. The cubic root of 205445057 is about 590.0632480314.

Adding to 205445057 its reverse (750544502), we get a palindrome (955989559).

The spelling of 205445057 in words is "two hundred five million, four hundred forty-five thousand, fifty-seven".