1280656831901 has 2 divisors, whose sum is σ = 1280656831902. Its totient is φ = 1280656831900.

The previous prime is 1280656831843. The next prime is 1280656832047. The reversal of 1280656831901 is 1091386560821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279624752025 + 1032079876 = 1131205^2 + 32126^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280656831901 - 2³⁴ = 1263476962717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1280656831901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280656834901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640328415950 + 640328415951.

It is an arithmetic number, because the mean of its divisors is an integer number (640328415951).

Almost surely, 2^{1280656831901} is an apocalyptic number.

It is an amenable number.

1280656831901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280656831901 is an equidigital number, since it uses as much as digits as its factorization.

1280656831901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 1280656831901 in words is "one trillion, two hundred eighty billion, six hundred fifty-six million, eight hundred thirty-one thousand, nine hundred one".