118544581 has 2 divisors, whose sum is σ = 118544582. Its totient is φ = 118544580.

The previous prime is 118544561. The next prime is 118544603. The reversal of 118544581 is 185445811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 50893956 = 8225^2 + 7134^2 .

It is a cyclic number.

It is not a de Polignac number, because 118544581 - 2⁷ = 118544453 is a prime.

It is a super-2 number, since 2×118544581² = 28105635368931122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 118544581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118544561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59272290 + 59272291.

It is an arithmetic number, because the mean of its divisors is an integer number (59272291).

Almost surely, 2^118544581 is an apocalyptic number.

It is an amenable number.

118544581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118544581 is an equidigital number, since it uses as much as digits as its factorization.

118544581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 37.

The square root of 118544581 is about 10887.8180091330. The cubic root of 118544581 is about 491.2402028058.

The spelling of 118544581 in words is "one hundred eighteen million, five hundred forty-four thousand, five hundred eighty-one".