1280197493 has 2 divisors, whose sum is σ = 1280197494. Its totient is φ = 1280197492.

The previous prime is 1280197487. The next prime is 1280197511. The reversal of 1280197493 is 3947910821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1246301809 + 33895684 = 35303^2 + 5822^2 .

It is an emirp because it is prime and its reverse (3947910821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1280197493 - 2²⁰ = 1279148917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280197433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640098746 + 640098747.

It is an arithmetic number, because the mean of its divisors is an integer number (640098747).

Almost surely, 2^1280197493 is an apocalyptic number.

It is an amenable number.

1280197493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280197493 is an equidigital number, since it uses as much as digits as its factorization.

1280197493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1280197493 is about 35779.8475821237. The cubic root of 1280197493 is about 1085.8228852744.

The spelling of 1280197493 in words is "one billion, two hundred eighty million, one hundred ninety-seven thousand, four hundred ninety-three".