118823981 has 2 divisors, whose sum is σ = 118823982. Its totient is φ = 118823980.

The previous prime is 118823977. The next prime is 118823987. The reversal of 118823981 is 189328811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 55875625 = 7934^2 + 7475^2 .

It is a cyclic number.

It is not a de Polignac number, because 118823981 - 2² = 118823977 is a prime.

It is a super-2 number, since 2×118823981² = 28238276921376722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_6778535 and since 118823981 and 6778535 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118823987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59411990 + 59411991.

It is an arithmetic number, because the mean of its divisors is an integer number (59411991).

Almost surely, 2^118823981 is an apocalyptic number.

It is an amenable number.

118823981 is a deficient number, since it is larger than the sum of its proper divisors (1).

118823981 is an equidigital number, since it uses as much as digits as its factorization.

118823981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 41.

The square root of 118823981 is about 10900.6413114092. The cubic root of 118823981 is about 491.6258378174.

The spelling of 118823981 in words is "one hundred eighteen million, eight hundred twenty-three thousand, nine hundred eighty-one".