1278881 has 2 divisors, whose sum is σ = 1278882. Its totient is φ = 1278880.

The previous prime is 1278857. The next prime is 1278899. The reversal of 1278881 is 1888721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 614656 = 815^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278881 - 2⁶ = 1278817 is a prime.

It is a super-2 number, since 2×1278881² = 3271073224322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639440 + 639441.

It is an arithmetic number, because the mean of its divisors is an integer number (639441).

2^1278881 is an apocalyptic number.

It is an amenable number.

1278881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278881 is an equidigital number, since it uses as much as digits as its factorization.

1278881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 35.

The square root of 1278881 is about 1130.8762089637. The cubic root of 1278881 is about 108.5450555089.

The spelling of 1278881 in words is "one million, two hundred seventy-eight thousand, eight hundred eighty-one".