118688861 has 2 divisors, whose sum is σ = 118688862. Its totient is φ = 118688860.

The previous prime is 118688831. The next prime is 118688879. The reversal of 118688861 is 168886811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90535225 + 28153636 = 9515^2 + 5306^2 .

It is an emirp because it is prime and its reverse (168886811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118688861 - 2¹⁰ = 118687837 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 (118688831) 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, 59344430 + 59344431.

It is an arithmetic number, because the mean of its divisors is an integer number (59344431).

Almost surely, 2^118688861 is an apocalyptic number.

It is an amenable number.

118688861 is a deficient number, since it is larger than the sum of its proper divisors (1).

118688861 is an equidigital number, since it uses as much as digits as its factorization.

118688861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147456, while the sum is 47.

The square root of 118688861 is about 10894.4417479741. The cubic root of 118688861 is about 491.4394173150.

The spelling of 118688861 in words is "one hundred eighteen million, six hundred eighty-eight thousand, eight hundred sixty-one".