1280309425 has 6 divisors (see below), whose sum is σ = 1587583718. Its totient is φ = 1024247520.

The previous prime is 1280309413. The next prime is 1280309441. The reversal of 1280309425 is 5249030821.

It can be written as a sum of positive squares in 3 ways, for example, as 90611361 + 1189698064 = 9519^2 + 34492^2 .

It is not a de Polignac number, because 1280309425 - 2¹¹ = 1280307377 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 25606164 + ... + 25606213.

Almost surely, 2^1280309425 is an apocalyptic number.

It is an amenable number.

1280309425 is a deficient number, since it is larger than the sum of its proper divisors (307274293).

1280309425 is an equidigital number, since it uses as much as digits as its factorization.

1280309425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51212387 (or 51212382 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1280309425 is about 35781.4117245253. The cubic root of 1280309425 is about 1085.8545300755.

The spelling of 1280309425 in words is "one billion, two hundred eighty million, three hundred nine thousand, four hundred twenty-five".