118466581 has 2 divisors, whose sum is σ = 118466582. Its totient is φ = 118466580.

The previous prime is 118466573. The next prime is 118466609. The reversal of 118466581 is 185664811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117180625 + 1285956 = 10825^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 118466581 - 2³ = 118466573 is a prime.

It is a super-2 number, since 2×118466581² = 28068661627659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118466561) 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, 59233290 + 59233291.

It is an arithmetic number, because the mean of its divisors is an integer number (59233291).

Almost surely, 2^118466581 is an apocalyptic number.

It is an amenable number.

118466581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118466581 is an equidigital number, since it uses as much as digits as its factorization.

118466581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 40.

The square root of 118466581 is about 10884.2354347928. The cubic root of 118466581 is about 491.1324370397.

The spelling of 118466581 in words is "one hundred eighteen million, four hundred sixty-six thousand, five hundred eighty-one".