1209665425 has 6 divisors (see below), whose sum is σ = 1499985158. Its totient is φ = 967732320.

The previous prime is 1209665423. The next prime is 1209665437. The reversal of 1209665425 is 5245669021.

It can be written as a sum of positive squares in 3 ways, for example, as 4464769 + 1205200656 = 2113^2 + 34716^2 .

It is not a de Polignac number, because 1209665425 - 2¹ = 1209665423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209665423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24193284 + ... + 24193333.

Almost surely, 2^1209665425 is an apocalyptic number.

It is an amenable number.

1209665425 is a deficient number, since it is larger than the sum of its proper divisors (290319733).

1209665425 is an equidigital number, since it uses as much as digits as its factorization.

1209665425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48386627 (or 48386622 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1209665425 is about 34780.2447518703. The cubic root of 1209665425 is about 1065.5040117710.

The spelling of 1209665425 in words is "one billion, two hundred nine million, six hundred sixty-five thousand, four hundred twenty-five".