1280972705 has 4 divisors (see below), whose sum is σ = 1537167252. Its totient is φ = 1024778160.

The previous prime is 1280972681. The next prime is 1280972753. The reversal of 1280972705 is 5072790821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5072790821 = 7 ⋅724684403.

It can be written as a sum of positive squares in 2 ways, for example, as 947654656 + 333318049 = 30784^2 + 18257^2 .

It is not a de Polignac number, because 1280972705 - 2²² = 1276778401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128097266 + ... + 128097275.

It is an arithmetic number, because the mean of its divisors is an integer number (384291813).

Almost surely, 2^1280972705 is an apocalyptic number.

It is an amenable number.

1280972705 is a deficient number, since it is larger than the sum of its proper divisors (256194547).

1280972705 is an equidigital number, since it uses as much as digits as its factorization.

1280972705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256194546.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 1280972705 is about 35790.6790240141. The cubic root of 1280972705 is about 1086.0420111226.

The spelling of 1280972705 in words is "one billion, two hundred eighty million, nine hundred seventy-two thousand, seven hundred five".