1305121225 has 12 divisors (see below), whose sum is σ = 1657823580. Its totient is φ = 1018630400.

The previous prime is 1305121217. The next prime is 1305121243. The reversal of 1305121225 is 5221215031.

It can be written as a sum of positive squares in 6 ways, for example, as 38900169 + 1266221056 = 6237^2 + 35584^2 .

It is not a de Polignac number, because 1305121225 - 2³ = 1305121217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1305121196 and 1305121205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 635620 + ... + 637669.

It is an arithmetic number, because the mean of its divisors is an integer number (138151965).

Almost surely, 2^1305121225 is an apocalyptic number.

It is an amenable number.

1305121225 is a deficient number, since it is larger than the sum of its proper divisors (352702355).

1305121225 is a wasteful number, since it uses less digits than its factorization.

1305121225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273340 (or 1273335 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1305121225 is about 36126.4615621292. The cubic root of 1305121225 is about 1092.8241510294.

Adding to 1305121225 its reverse (5221215031), we get a palindrome (6526336256).

The spelling of 1305121225 in words is "one billion, three hundred five million, one hundred twenty-one thousand, two hundred twenty-five".