83706221 has 2 divisors, whose sum is σ = 83706222. Its totient is φ = 83706220.

The previous prime is 83706199. The next prime is 83706281. The reversal of 83706221 is 12260738.

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., 83521321 + 184900 = 9139^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 83706221 - 2⁶ = 83706157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83706281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41853110 + 41853111.

It is an arithmetic number, because the mean of its divisors is an integer number (41853111).

Almost surely, 2^83706221 is an apocalyptic number.

It is an amenable number.

83706221 is a deficient number, since it is larger than the sum of its proper divisors (1).

83706221 is an equidigital number, since it uses as much as digits as its factorization.

83706221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 83706221 is about 9149.1103939126. The cubic root of 83706221 is about 437.4407578015.

Adding to 83706221 its reverse (12260738), we get a palindrome (95966959).

The spelling of 83706221 in words is "eighty-three million, seven hundred six thousand, two hundred twenty-one".