1263205133 has 4 divisors (see below), whose sum is σ = 1264491168. Its totient is φ = 1261919100.

The previous prime is 1263205117. The next prime is 1263205159. The reversal of 1263205133 is 3315023621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1263205133 - 2⁴ = 1263205117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263205193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641543 + ... + 643508.

It is an arithmetic number, because the mean of its divisors is an integer number (316122792).

Almost surely, 2^1263205133 is an apocalyptic number.

It is an amenable number.

1263205133 is a deficient number, since it is larger than the sum of its proper divisors (1286035).

1263205133 is an equidigital number, since it uses as much as digits as its factorization.

1263205133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286034.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 1263205133 is about 35541.5972207215. The cubic root of 1263205133 is about 1080.9973448761.

Adding to 1263205133 its reverse (3315023621), we get a palindrome (4578228754).

The spelling of 1263205133 in words is "one billion, two hundred sixty-three million, two hundred five thousand, one hundred thirty-three".