1280225689 has 2 divisors, whose sum is σ = 1280225690. Its totient is φ = 1280225688.

The previous prime is 1280225657. The next prime is 1280225707. The reversal of 1280225689 is 9865220821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1270566025 + 9659664 = 35645^2 + 3108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280225689 - 2⁵ = 1280225657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280225629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640112844 + 640112845.

It is an arithmetic number, because the mean of its divisors is an integer number (640112845).

Almost surely, 2^1280225689 is an apocalyptic number.

It is an amenable number.

1280225689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280225689 is an equidigital number, since it uses as much as digits as its factorization.

1280225689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1280225689 is about 35780.2416006376. The cubic root of 1280225689 is about 1085.8308568667.

The spelling of 1280225689 in words is "one billion, two hundred eighty million, two hundred twenty-five thousand, six hundred eighty-nine".