118639109 has 2 divisors, whose sum is σ = 118639110. Its totient is φ = 118639108.

The previous prime is 118639099. The next prime is 118639127. The reversal of 118639109 is 901936811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109788484 + 8850625 = 10478^2 + 2975^2 .

It is an emirp because it is prime and its reverse (901936811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118639109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118639189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59319554 + 59319555.

It is an arithmetic number, because the mean of its divisors is an integer number (59319555).

Almost surely, 2^118639109 is an apocalyptic number.

It is an amenable number.

118639109 is a deficient number, since it is larger than the sum of its proper divisors (1).

118639109 is an equidigital number, since it uses as much as digits as its factorization.

118639109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 118639109 is about 10892.1581424436. The cubic root of 118639109 is about 491.3707405220.

The spelling of 118639109 in words is "one hundred eighteen million, six hundred thirty-nine thousand, one hundred nine".