118987181 has 2 divisors, whose sum is σ = 118987182. Its totient is φ = 118987180.

The previous prime is 118987133. The next prime is 118987213. The reversal of 118987181 is 181789811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 13205956 = 10285^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 118987181 - 2¹⁰ = 118986157 is a prime.

It is a super-2 number, since 2×118987181² = 28315898484653522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118987111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59493590 + 59493591.

It is an arithmetic number, because the mean of its divisors is an integer number (59493591).

Almost surely, 2^118987181 is an apocalyptic number.

It is an amenable number.

118987181 is a deficient number, since it is larger than the sum of its proper divisors (1).

118987181 is an equidigital number, since it uses as much as digits as its factorization.

118987181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 44.

The square root of 118987181 is about 10908.1245409099. The cubic root of 118987181 is about 491.8508110134.

The spelling of 118987181 in words is "one hundred eighteen million, nine hundred eighty-seven thousand, one hundred eighty-one".