1278481 has 2 divisors, whose sum is σ = 1278482. Its totient is φ = 1278480.

The previous prime is 1278479. The next prime is 1278493. The reversal of 1278481 is 1848721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781456 + 497025 = 884^2 + 705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278481 - 2¹ = 1278479 is a prime.

It is a super-2 number, since 2×1278481² = 3269027334722, which contains 22 as substring.

Together with 1278479, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1278401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639240 + 639241.

It is an arithmetic number, because the mean of its divisors is an integer number (639241).

2^1278481 is an apocalyptic number.

It is an amenable number.

1278481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278481 is an equidigital number, since it uses as much as digits as its factorization.

1278481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 1278481 is about 1130.6993411159. The cubic root of 1278481 is about 108.5337376590.

The spelling of 1278481 in words is "one million, two hundred seventy-eight thousand, four hundred eighty-one".