188740117 has 2 divisors, whose sum is σ = 188740118. Its totient is φ = 188740116.

The previous prime is 188740099. The next prime is 188740147. The reversal of 188740117 is 711047881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145588356 + 43151761 = 12066^2 + 6569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188740117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188740147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94370058 + 94370059.

It is an arithmetic number, because the mean of its divisors is an integer number (94370059).

Almost surely, 2^188740117 is an apocalyptic number.

It is an amenable number.

188740117 is a deficient number, since it is larger than the sum of its proper divisors (1).

188740117 is an equidigital number, since it uses as much as digits as its factorization.

188740117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 37.

The square root of 188740117 is about 13738.2719801291. The cubic root of 188740117 is about 573.6161980429.

Adding to 188740117 its reverse (711047881), we get a palindrome (899787998).

The spelling of 188740117 in words is "one hundred eighty-eight million, seven hundred forty thousand, one hundred seventeen".