1281280015 has 4 divisors (see below), whose sum is σ = 1537536024. Its totient is φ = 1025024008.

The previous prime is 1281280009. The next prime is 1281280037. The reversal of 1281280015 is 5100821821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5100821821 = 211 ⋅24174511.

It is a cyclic number.

It is not a de Polignac number, because 1281280015 - 2¹¹ = 1281277967 is a prime.

It is a Duffinian number.

It is a congruent 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, 128127997 + ... + 128128006.

It is an arithmetic number, because the mean of its divisors is an integer number (384384006).

Almost surely, 2^1281280015 is an apocalyptic number.

1281280015 is a deficient number, since it is larger than the sum of its proper divisors (256256009).

1281280015 is an equidigital number, since it uses as much as digits as its factorization.

1281280015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256256008.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 1281280015 is about 35794.9719234420. The cubic root of 1281280015 is about 1086.1288526515.

The spelling of 1281280015 in words is "one billion, two hundred eighty-one million, two hundred eighty thousand, fifteen".