1278482281 has 4 divisors (see below), whose sum is σ = 1278743632. Its totient is φ = 1278220932.

The previous prime is 1278482251. The next prime is 1278482299. The reversal of 1278482281 is 1822848721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1822848721 = 5651 ⋅322571.

It is a cyclic number.

It is not a de Polignac number, because 1278482281 - 2⁹ = 1278481769 is a prime.

It is a super-2 number, since 2×1278482281² = 3269033885661925922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278482251) 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, 123195 + ... + 133168.

It is an arithmetic number, because the mean of its divisors is an integer number (319685908).

Almost surely, 2^1278482281 is an apocalyptic number.

It is an amenable number.

1278482281 is a deficient number, since it is larger than the sum of its proper divisors (261351).

1278482281 is an equidigital number, since it uses as much as digits as its factorization.

1278482281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261350.

The product of its digits is 114688, while the sum is 43.

The square root of 1278482281 is about 35755.8705809270. The cubic root of 1278482281 is about 1085.3377390816.

The spelling of 1278482281 in words is "one billion, two hundred seventy-eight million, four hundred eighty-two thousand, two hundred eighty-one".