118808821 has 2 divisors, whose sum is σ = 118808822. Its totient is φ = 118808820.

The previous prime is 118808819. The next prime is 118808827. The reversal of 118808821 is 128808811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75446596 + 43362225 = 8686^2 + 6585^2 .

It is a cyclic number.

It is not a de Polignac number, because 118808821 - 2¹ = 118808819 is a prime.

Together with 118808819, 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 (118808827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59404410 + 59404411.

It is an arithmetic number, because the mean of its divisors is an integer number (59404411).

Almost surely, 2^118808821 is an apocalyptic number.

It is an amenable number.

118808821 is a deficient number, since it is larger than the sum of its proper divisors (1).

118808821 is an equidigital number, since it uses as much as digits as its factorization.

118808821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8192, while the sum is 37.

The square root of 118808821 is about 10899.9459172970. The cubic root of 118808821 is about 491.6049291181.

The spelling of 118808821 in words is "one hundred eighteen million, eight hundred eight thousand, eight hundred twenty-one".