118508161 has 2 divisors, whose sum is σ = 118508162. Its totient is φ = 118508160.

The previous prime is 118508141. The next prime is 118508183. The reversal of 118508161 is 161805811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 53802225 = 8044^2 + 7335^2 .

It is an emirp because it is prime and its reverse (161805811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118508161 is a prime.

It is not a weakly prime, because it can be changed into another prime (118508141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59254080 + 59254081.

It is an arithmetic number, because the mean of its divisors is an integer number (59254081).

Almost surely, 2^118508161 is an apocalyptic number.

It is an amenable number.

118508161 is a deficient number, since it is larger than the sum of its proper divisors (1).

118508161 is an equidigital number, since it uses as much as digits as its factorization.

118508161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 31.

The square root of 118508161 is about 10886.1453692296. The cubic root of 118508161 is about 491.1898903677.

The spelling of 118508161 in words is "one hundred eighteen million, five hundred eight thousand, one hundred sixty-one".