118845581 has 2 divisors, whose sum is σ = 118845582. Its totient is φ = 118845580.

The previous prime is 118845553. The next prime is 118845673. The reversal of 118845581 is 185548811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102313225 + 16532356 = 10115^2 + 4066^2 .

It is a cyclic number.

It is not a de Polignac number, because 118845581 - 2²⁶ = 51736717 is a prime.

It is a super-2 number, since 2×118845581² = 28248544246455122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118845481) 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, 59422790 + 59422791.

It is an arithmetic number, because the mean of its divisors is an integer number (59422791).

Almost surely, 2^118845581 is an apocalyptic number.

It is an amenable number.

118845581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118845581 is an equidigital number, since it uses as much as digits as its factorization.

118845581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51200, while the sum is 41.

The square root of 118845581 is about 10901.6320337828. The cubic root of 118845581 is about 491.6556255046.

The spelling of 118845581 in words is "one hundred eighteen million, eight hundred forty-five thousand, five hundred eighty-one".