1280197993 has 2 divisors, whose sum is σ = 1280197994. Its totient is φ = 1280197992.

The previous prime is 1280197967. The next prime is 1280198027. The reversal of 1280197993 is 3997910821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026369369 + 253828624 = 32037^2 + 15932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280197993 - 2²¹ = 1278100841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280197493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640098996 + 640098997.

It is an arithmetic number, because the mean of its divisors is an integer number (640098997).

Almost surely, 2^1280197993 is an apocalyptic number.

It is an amenable number.

1280197993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280197993 is an equidigital number, since it uses as much as digits as its factorization.

1280197993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 1280197993 is about 35779.8545692964. The cubic root of 1280197993 is about 1085.8230266358.

The spelling of 1280197993 in words is "one billion, two hundred eighty million, one hundred ninety-seven thousand, nine hundred ninety-three".