1278617 has 2 divisors, whose sum is σ = 1278618. Its totient is φ = 1278616.

The previous prime is 1278611. The next prime is 1278619. The reversal of 1278617 is 7168721.

1278617 is nontrivially palindromic in base 3.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952576 + 326041 = 976^2 + 571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278617 - 2⁴ = 1278601 is a prime.

It is a super-3 number, since 3×1278617³ = 6271084861441533339, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1278619, 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 (1278611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639308 + 639309.

It is an arithmetic number, because the mean of its divisors is an integer number (639309).

2^1278617 is an apocalyptic number.

It is an amenable number.

1278617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278617 is an equidigital number, since it uses as much as digits as its factorization.

1278617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 32.

The square root of 1278617 is about 1130.7594792881. The cubic root of 1278617 is about 108.5375859928.

The spelling of 1278617 in words is "one million, two hundred seventy-eight thousand, six hundred seventeen".