1205545625 has 10 divisors (see below), whose sum is σ = 1506450594. Its totient is φ = 964436000.

The previous prime is 1205545619. The next prime is 1205545651. The reversal of 1205545625 is 5265455021.

It can be written as a sum of positive squares in 5 ways, for example, as 823460416 + 382085209 = 28696^2 + 19547^2 .

It is not a de Polignac number, because 1205545625 - 2²² = 1201351321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 963812 + ... + 965061.

Almost surely, 2^1205545625 is an apocalyptic number.

It is an amenable number.

1205545625 is a deficient number, since it is larger than the sum of its proper divisors (300904969).

1205545625 is an frugal number, since it uses more digits than its factorization.

1205545625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928893 (or 1928878 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 1205545625 is about 34720.9680884620. The cubic root of 1205545625 is about 1064.2930278271.

The spelling of 1205545625 in words is "one billion, two hundred five million, five hundred forty-five thousand, six hundred twenty-five".