118918861 has 2 divisors, whose sum is σ = 118918862. Its totient is φ = 118918860.

The previous prime is 118918847. The next prime is 118918867. The reversal of 118918861 is 168819811.

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., 72420100 + 46498761 = 8510^2 + 6819^2 .

It is an emirp because it is prime and its reverse (168819811) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 198816811 and 118618891.

It is a cyclic number.

It is not a de Polignac number, because 118918861 - 2⁷ = 118918733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118918867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59459430 + 59459431.

It is an arithmetic number, because the mean of its divisors is an integer number (59459431).

Almost surely, 2^118918861 is an apocalyptic number.

It is an amenable number.

118918861 is a deficient number, since it is larger than the sum of its proper divisors (1).

118918861 is an equidigital number, since it uses as much as digits as its factorization.

118918861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 43.

The square root of 118918861 is about 10904.9924805109. The cubic root of 118918861 is about 491.7566561064.

The spelling of 118918861 in words is "one hundred eighteen million, nine hundred eighteen thousand, eight hundred sixty-one".