1219778863 has 2 divisors, whose sum is σ = 1219778864. Its totient is φ = 1219778862.

The previous prime is 1219778809. The next prime is 1219778867. The reversal of 1219778863 is 3688779121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219778863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1219778863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219778867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609889431 + 609889432.

It is an arithmetic number, because the mean of its divisors is an integer number (609889432).

Almost surely, 2^1219778863 is an apocalyptic number.

1219778863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219778863 is an equidigital number, since it uses as much as digits as its factorization.

1219778863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 1219778863 is about 34925.3326827390. The cubic root of 1219778863 is about 1068.4651657398.

The spelling of 1219778863 in words is "one billion, two hundred nineteen million, seven hundred seventy-eight thousand, eight hundred sixty-three".