118782821 has 2 divisors, whose sum is σ = 118782822. Its totient is φ = 118782820.

The previous prime is 118782817. The next prime is 118782841. The reversal of 118782821 is 128287811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118701025 + 81796 = 10895^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 118782821 - 2² = 118782817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118782841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59391410 + 59391411.

It is an arithmetic number, because the mean of its divisors is an integer number (59391411).

Almost surely, 2^118782821 is an apocalyptic number.

It is an amenable number.

118782821 is a deficient number, since it is larger than the sum of its proper divisors (1).

118782821 is an equidigital number, since it uses as much as digits as its factorization.

118782821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 38.

The square root of 118782821 is about 10898.7531855713. The cubic root of 118782821 is about 491.5690657297.

The spelling of 118782821 in words is "one hundred eighteen million, seven hundred eighty-two thousand, eight hundred twenty-one".