83718221 has 2 divisors, whose sum is σ = 83718222. Its totient is φ = 83718220.

The previous prime is 83718211. The next prime is 83718241. The reversal of 83718221 is 12281738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74200996 + 9517225 = 8614^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 83718221 - 2¹⁴ = 83701837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83718211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41859110 + 41859111.

It is an arithmetic number, because the mean of its divisors is an integer number (41859111).

Almost surely, 2^83718221 is an apocalyptic number.

It is an amenable number.

83718221 is a deficient number, since it is larger than the sum of its proper divisors (1).

83718221 is an equidigital number, since it uses as much as digits as its factorization.

83718221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 83718221 is about 9149.7661718757. The cubic root of 83718221 is about 437.4616604226.

Adding to 83718221 its reverse (12281738), we get a palindrome (95999959).

The spelling of 83718221 in words is "eighty-three million, seven hundred eighteen thousand, two hundred twenty-one".