1278481129 has 6 divisors (see below), whose sum is σ = 1291274990. Its totient is φ = 1265812800.

The previous prime is 1278481111. The next prime is 1278481163. The reversal of 1278481129 is 9211848721.

It can be written as a sum of positive squares in 3 ways, for example, as 1099055104 + 179426025 = 33152^2 + 13395^2 .

It is not a de Polignac number, because 1278481129 - 2⁵ = 1278481097 is a prime.

It is a super-2 number, since 2×1278481129² = 3269027994418229282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278488129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52464 + ... + 72865.

Almost surely, 2^1278481129 is an apocalyptic number.

It is an amenable number.

1278481129 is a deficient number, since it is larger than the sum of its proper divisors (12793861).

1278481129 is an equidigital number, since it uses as much as digits as its factorization.

1278481129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125531 (or 125430 counting only the distinct ones).

The product of its digits is 64512, while the sum is 43.

The square root of 1278481129 is about 35755.8544716806. The cubic root of 1278481129 is about 1085.3374130937.

The spelling of 1278481129 in words is "one billion, two hundred seventy-eight million, four hundred eighty-one thousand, one hundred twenty-nine".