1205521225 has 24 divisors (see below), whose sum is σ = 1511331840. Its totient is φ = 953838720.

The previous prime is 1205521193. The next prime is 1205521279. The reversal of 1205521225 is 5221255021.

It is not a de Polignac number, because 1205521225 - 2⁵ = 1205521193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1205521225.

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 23 ways as a sum of consecutive naturals, for example, 1311316 + ... + 1312234.

It is an arithmetic number, because the mean of its divisors is an integer number (62972160).

Almost surely, 2^1205521225 is an apocalyptic number.

It is an amenable number.

1205521225 is a deficient number, since it is larger than the sum of its proper divisors (305810615).

1205521225 is a wasteful number, since it uses less digits than its factorization.

1205521225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1444 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1205521225 is about 34720.6167139929. The cubic root of 1205521225 is about 1064.2858474200.

Adding to 1205521225 its reverse (5221255021), we get a palindrome (6426776246).

The spelling of 1205521225 in words is "one billion, two hundred five million, five hundred twenty-one thousand, two hundred twenty-five".