118212181 has 2 divisors, whose sum is σ = 118212182. Its totient is φ = 118212180.

The previous prime is 118212179. The next prime is 118212217. The reversal of 118212181 is 181212811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113081956 + 5130225 = 10634^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 118212181 - 2¹ = 118212179 is a prime.

It is a super-2 number, since 2×118212181² = 27948239473553522, which contains 22 as substring.

Together with 118212179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118212131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59106090 + 59106091.

It is an arithmetic number, because the mean of its divisors is an integer number (59106091).

Almost surely, 2^118212181 is an apocalyptic number.

It is an amenable number.

118212181 is a deficient number, since it is larger than the sum of its proper divisors (1).

118212181 is an equidigital number, since it uses as much as digits as its factorization.

118212181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 25.

The square root of 118212181 is about 10872.5425269345. The cubic root of 118212181 is about 490.7806257680.

Adding to 118212181 its reverse (181212811), we get a palindrome (299424992).

The spelling of 118212181 in words is "one hundred eighteen million, two hundred twelve thousand, one hundred eighty-one".