117785081 has 2 divisors, whose sum is σ = 117785082. Its totient is φ = 117785080.

The previous prime is 117785077. The next prime is 117785099. The reversal of 117785081 is 180587711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 29800681 = 9380^2 + 5459^2 .

It is an emirp because it is prime and its reverse (180587711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117785081 - 2² = 117785077 is a prime.

It is a super-2 number, since 2×117785081² = 27746650612353122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (117785021) 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, 58892540 + 58892541.

It is an arithmetic number, because the mean of its divisors is an integer number (58892541).

Almost surely, 2^117785081 is an apocalyptic number.

It is an amenable number.

117785081 is a deficient number, since it is larger than the sum of its proper divisors (1).

117785081 is an equidigital number, since it uses as much as digits as its factorization.

117785081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 38.

The square root of 117785081 is about 10852.8835338817. The cubic root of 117785081 is about 490.1888498775.

The spelling of 117785081 in words is "one hundred seventeen million, seven hundred eighty-five thousand, eighty-one".