1272617281 has 4 divisors (see below), whose sum is σ = 1370510932. Its totient is φ = 1174723632.

The previous prime is 1272617273. The next prime is 1272617303. The reversal of 1272617281 is 1827162721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1827162721 = 19 ⋅96166459.

It can be written as a sum of positive squares in 2 ways, for example, as 875213056 + 397404225 = 29584^2 + 19935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272617281 - 2³ = 1272617273 is a prime.

It is a super-2 number, since 2×1272617281² = 3239109487799665922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272617281.

It is not an unprimeable number, because it can be changed into a prime (1272617201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48946806 + ... + 48946831.

It is an arithmetic number, because the mean of its divisors is an integer number (342627733).

Almost surely, 2^1272617281 is an apocalyptic number.

It is an amenable number.

1272617281 is a deficient number, since it is larger than the sum of its proper divisors (97893651).

1272617281 is an equidigital number, since it uses as much as digits as its factorization.

1272617281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97893650.

The product of its digits is 18816, while the sum is 37.

The square root of 1272617281 is about 35673.7618005166. The cubic root of 1272617281 is about 1083.6755430347.

The spelling of 1272617281 in words is "one billion, two hundred seventy-two million, six hundred seventeen thousand, two hundred eighty-one".