1280722256101 has 8 divisors (see below), whose sum is σ = 1295145414360. Its totient is φ = 1266299831808.

The previous prime is 1280722256071. The next prime is 1280722256123. The reversal of 1280722256101 is 1016522270821.

It is a happy number.

It is a Cunningham number, because it is equal to 1131690²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1280722256100 = 1^2 + 1131690^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1280722256101 - 2⁵ = 1280722256069 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 (1280722256131) 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, 3813355 + ... + 4135591.

It is an arithmetic number, because the mean of its divisors is an integer number (161893176795).

Almost surely, 2^{1280722256101} is an apocalyptic number.

It is an amenable number.

1280722256101 is a deficient number, since it is larger than the sum of its proper divisors (14423158259).

1280722256101 is an equidigital number, since it uses as much as digits as its factorization.

1280722256101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366983.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 1280722256101 in words is "one trillion, two hundred eighty billion, seven hundred twenty-two million, two hundred fifty-six thousand, one hundred one".