1205312564 has 6 divisors (see below), whose sum is σ = 2109296994. Its totient is φ = 602656280.

The previous prime is 1205312561. The next prime is 1205312609. The reversal of 1205312564 is 4652135021.

It can be written as a sum of positive squares in only one way, i.e., 951228964 + 254083600 = 30842^2 + 15940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205312561) 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 as a sum of consecutive naturals, namely, 150664067 + ... + 150664074.

It is an arithmetic number, because the mean of its divisors is an integer number (351549499).

Almost surely, 2^1205312564 is an apocalyptic number.

It is an amenable number.

1205312564 is a deficient number, since it is larger than the sum of its proper divisors (903984430).

1205312564 is a wasteful number, since it uses less digits than its factorization.

1205312564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301328145 (or 301328143 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1205312564 is about 34717.6117266151. The cubic root of 1205312564 is about 1064.2244389164.

Adding to 1205312564 its reverse (4652135021), we get a palindrome (5857447585).

The spelling of 1205312564 in words is "one billion, two hundred five million, three hundred twelve thousand, five hundred sixty-four".