118585721 has 2 divisors, whose sum is σ = 118585722. Its totient is φ = 118585720.

The previous prime is 118585717. The next prime is 118585741. The reversal of 118585721 is 127585811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92371321 + 26214400 = 9611^2 + 5120^2 .

It is an emirp because it is prime and its reverse (127585811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118585721 - 2² = 118585717 is a prime.

It is not a weakly prime, because it can be changed into another prime (118585741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59292860 + 59292861.

It is an arithmetic number, because the mean of its divisors is an integer number (59292861).

Almost surely, 2^118585721 is an apocalyptic number.

It is an amenable number.

118585721 is a deficient number, since it is larger than the sum of its proper divisors (1).

118585721 is an equidigital number, since it uses as much as digits as its factorization.

118585721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 38.

The square root of 118585721 is about 10889.7071126821. The cubic root of 118585721 is about 491.2970232986.

The spelling of 118585721 in words is "one hundred eighteen million, five hundred eighty-five thousand, seven hundred twenty-one".