1117678817 has 2 divisors, whose sum is σ = 1117678818. Its totient is φ = 1117678816.

The previous prime is 1117678789. The next prime is 1117678823. The reversal of 1117678817 is 7188767111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068243856 + 49434961 = 32684^2 + 7031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117678817 - 2⁸ = 1117678561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1117678117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558839408 + 558839409.

It is an arithmetic number, because the mean of its divisors is an integer number (558839409).

Almost surely, 2^1117678817 is an apocalyptic number.

It is an amenable number.

1117678817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117678817 is an equidigital number, since it uses as much as digits as its factorization.

1117678817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 47.

The square root of 1117678817 is about 33431.7037705230. The cubic root of 1117678817 is about 1037.7808998343.

The spelling of 1117678817 in words is "one billion, one hundred seventeen million, six hundred seventy-eight thousand, eight hundred seventeen".