1278628163 has 2 divisors, whose sum is σ = 1278628164. Its totient is φ = 1278628162.

The previous prime is 1278628111. The next prime is 1278628171. The reversal of 1278628163 is 3618268721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278628163 - 2²² = 1274433859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278628063) 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 as a sum of consecutive naturals, namely, 639314081 + 639314082.

It is an arithmetic number, because the mean of its divisors is an integer number (639314082).

Almost surely, 2^1278628163 is an apocalyptic number.

1278628163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278628163 is an equidigital number, since it uses as much as digits as its factorization.

1278628163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 1278628163 is about 35757.9104954414. The cubic root of 1278628163 is about 1085.3790185530.

The spelling of 1278628163 in words is "one billion, two hundred seventy-eight million, six hundred twenty-eight thousand, one hundred sixty-three".