1280775197 has 8 divisors (see below), whose sum is σ = 1381091544. Its totient is φ = 1180715328.

The previous prime is 1280775191. The next prime is 1280775247. The reversal of 1280775197 is 7915770821.

It can be written as a sum of positive squares in 4 ways, for example, as 126202756 + 1154572441 = 11234^2 + 33979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1280775197 - 2²⁰ = 1279726621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280775191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53678 + ... + 73775.

It is an arithmetic number, because the mean of its divisors is an integer number (172636443).

Almost surely, 2^1280775197 is an apocalyptic number.

It is an amenable number.

1280775197 is a deficient number, since it is larger than the sum of its proper divisors (100316347).

1280775197 is a wasteful number, since it uses less digits than its factorization.

1280775197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128239.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 1280775197 is about 35787.9197076332. The cubic root of 1280775197 is about 1085.9861907786.

The spelling of 1280775197 in words is "one billion, two hundred eighty million, seven hundred seventy-five thousand, one hundred ninety-seven".