118841581 has 2 divisors, whose sum is σ = 118841582. Its totient is φ = 118841580.

The previous prime is 118841533. The next prime is 118841617. The reversal of 118841581 is 185148811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104142025 + 14699556 = 10205^2 + 3834^2 .

It is a cyclic number.

It is not a de Polignac number, because 118841581 - 2¹⁹ = 118317293 is a prime.

It is a super-2 number, since 2×118841581² = 28246642749159122, 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 118841581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118841531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59420790 + 59420791.

It is an arithmetic number, because the mean of its divisors is an integer number (59420791).

Almost surely, 2^118841581 is an apocalyptic number.

It is an amenable number.

118841581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118841581 is an equidigital number, since it uses as much as digits as its factorization.

118841581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10240, while the sum is 37.

The square root of 118841581 is about 10901.4485734695. The cubic root of 118841581 is about 491.6501095385.

The spelling of 118841581 in words is "one hundred eighteen million, eight hundred forty-one thousand, five hundred eighty-one".