1378217089 has 2 divisors, whose sum is σ = 1378217090. Its totient is φ = 1378217088.

The previous prime is 1378217059. The next prime is 1378217171. The reversal of 1378217089 is 9807128731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341976689 + 36240400 = 36633^2 + 6020^2 .

It is an emirp because it is prime and its reverse (9807128731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378217089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378217039) 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, 689108544 + 689108545.

It is an arithmetic number, because the mean of its divisors is an integer number (689108545).

Almost surely, 2^1378217089 is an apocalyptic number.

It is an amenable number.

1378217089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378217089 is an equidigital number, since it uses as much as digits as its factorization.

1378217089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 1378217089 is about 37124.3463107433. The cubic root of 1378217089 is about 1112.8566112412.

The spelling of 1378217089 in words is "one billion, three hundred seventy-eight million, two hundred seventeen thousand, eighty-nine".