1225242009 has 12 divisors (see below), whose sum is σ = 1787318052. Its totient is φ = 808740000.

The previous prime is 1225241989. The next prime is 1225242019. The reversal of 1225242009 is 9002425221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 868598784 + 356643225 = 29472^2 + 18885^2 .

It is not a de Polignac number, because 1225242009 - 2⁵ = 1225241977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225242019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 673042 + ... + 674859.

It is an arithmetic number, because the mean of its divisors is an integer number (148943171).

Almost surely, 2^1225242009 is an apocalyptic number.

It is an amenable number.

1225242009 is a deficient number, since it is larger than the sum of its proper divisors (562076043).

1225242009 is a wasteful number, since it uses less digits than its factorization.

1225242009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348008 (or 1348005 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1225242009 is about 35003.4571006922. The cubic root of 1225242009 is about 1070.0579375854.

The spelling of 1225242009 in words is "one billion, two hundred twenty-five million, two hundred forty-two thousand, nine".