1213225205 has 4 divisors (see below), whose sum is σ = 1455870252. Its totient is φ = 970580160.

The previous prime is 1213225163. The next prime is 1213225261. The reversal of 1213225205 is 5025223121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025223121 = 383 ⋅13120687.

It can be written as a sum of positive squares in 2 ways, for example, as 923612881 + 289612324 = 30391^2 + 17018^2 .

It is not a de Polignac number, because 1213225205 - 2¹⁸ = 1212963061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121322516 + ... + 121322525.

It is an arithmetic number, because the mean of its divisors is an integer number (363967563).

Almost surely, 2^1213225205 is an apocalyptic number.

It is an amenable number.

1213225205 is a deficient number, since it is larger than the sum of its proper divisors (242645047).

1213225205 is an equidigital number, since it uses as much as digits as its factorization.

1213225205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242645046.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1213225205 is about 34831.3824732812. The cubic root of 1213225205 is about 1066.5481697250.

Adding to 1213225205 its reverse (5025223121), we get a palindrome (6238448326).

The spelling of 1213225205 in words is "one billion, two hundred thirteen million, two hundred twenty-five thousand, two hundred five".