118619821 has 2 divisors, whose sum is σ = 118619822. Its totient is φ = 118619820.

The previous prime is 118619819. The next prime is 118619833. The reversal of 118619821 is 128916811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 57608100 = 7811^2 + 7590^2 .

It is a cyclic number.

It is not a de Polignac number, because 118619821 - 2¹ = 118619819 is a prime.

Together with 118619819, 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 (118619021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59309910 + 59309911.

It is an arithmetic number, because the mean of its divisors is an integer number (59309911).

Almost surely, 2^118619821 is an apocalyptic number.

It is an amenable number.

118619821 is a deficient number, since it is larger than the sum of its proper divisors (1).

118619821 is an equidigital number, since it uses as much as digits as its factorization.

118619821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 37.

The square root of 118619821 is about 10891.2726988172. The cubic root of 118619821 is about 491.3441105386.

The spelling of 118619821 in words is "one hundred eighteen million, six hundred nineteen thousand, eight hundred twenty-one".