117809869 has 2 divisors, whose sum is σ = 117809870. Its totient is φ = 117809868.

The previous prime is 117809821. The next prime is 117809891. The reversal of 117809869 is 968908711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86304100 + 31505769 = 9290^2 + 5613^2 .

It is an emirp because it is prime and its reverse (968908711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117809869 - 2²³ = 109421261 is a prime.

It is a super-2 number, since 2×117809869² = 27758330467594322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117809819) 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, 58904934 + 58904935.

It is an arithmetic number, because the mean of its divisors is an integer number (58904935).

Almost surely, 2^117809869 is an apocalyptic number.

It is an amenable number.

117809869 is a deficient number, since it is larger than the sum of its proper divisors (1).

117809869 is an equidigital number, since it uses as much as digits as its factorization.

117809869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 117809869 is about 10854.0254744496. The cubic root of 117809869 is about 490.2232343933.

The spelling of 117809869 in words is "one hundred seventeen million, eight hundred nine thousand, eight hundred sixty-nine".