1117678789 has 2 divisors, whose sum is σ = 1117678790. Its totient is φ = 1117678788.

The previous prime is 1117678777. The next prime is 1117678817. The reversal of 1117678789 is 9878767111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090980900 + 26697889 = 33030^2 + 5167^2 .

It is an emirp because it is prime and its reverse (9878767111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1117678789 - 2¹⁵ = 1117646021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1117678739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558839394 + 558839395.

It is an arithmetic number, because the mean of its divisors is an integer number (558839395).

Almost surely, 2^1117678789 is an apocalyptic number.

It is an amenable number.

1117678789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117678789 is an equidigital number, since it uses as much as digits as its factorization.

1117678789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 55.

The square root of 1117678789 is about 33431.7033517588. The cubic root of 1117678789 is about 1037.7808911682.

The spelling of 1117678789 in words is "one billion, one hundred seventeen million, six hundred seventy-eight thousand, seven hundred eighty-nine".