1205503217 has 2 divisors, whose sum is σ = 1205503218. Its totient is φ = 1205503216.

The previous prime is 1205503183. The next prime is 1205503223. The reversal of 1205503217 is 7123055021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833823376 + 371679841 = 28876^2 + 19279^2 .

It is an emirp because it is prime and its reverse (7123055021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205503217 - 2⁶ = 1205503153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205203217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602751608 + 602751609.

It is an arithmetic number, because the mean of its divisors is an integer number (602751609).

Almost surely, 2^1205503217 is an apocalyptic number.

It is an amenable number.

1205503217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205503217 is an equidigital number, since it uses as much as digits as its factorization.

1205503217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 1205503217 is about 34720.3573858335. The cubic root of 1205503217 is about 1064.2805479820.

Adding to 1205503217 its reverse (7123055021), we get a palindrome (8328558238).

The spelling of 1205503217 in words is "one billion, two hundred five million, five hundred three thousand, two hundred seventeen".