1280425673 has 2 divisors, whose sum is σ = 1280425674. Its totient is φ = 1280425672.

The previous prime is 1280425649. The next prime is 1280425681. The reversal of 1280425673 is 3765240821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135150864 + 145274809 = 33692^2 + 12053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280425673 - 2⁸ = 1280425417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1280425273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640212836 + 640212837.

It is an arithmetic number, because the mean of its divisors is an integer number (640212837).

Almost surely, 2^1280425673 is an apocalyptic number.

It is an amenable number.

1280425673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280425673 is an equidigital number, since it uses as much as digits as its factorization.

1280425673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1280425673 is about 35783.0361065128. The cubic root of 1280425673 is about 1085.8873931201.

The spelling of 1280425673 in words is "one billion, two hundred eighty million, four hundred twenty-five thousand, six hundred seventy-three".