706522221 has 6 divisors (see below), whose sum is σ = 1020532110. Its totient is φ = 471014808.

The previous prime is 706522213. The next prime is 706522247. The reversal of 706522221 is 122225607.

706522221 is a `hidden beast` number, since 7 + 0 + 652 + 2 + 2 + 2 + 1 = 666.

706522221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 417998025 + 288524196 = 20445^2 + 16986^2 .

It is not a de Polignac number, because 706522221 - 2³ = 706522213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706523221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39251226 + ... + 39251243.

It is an arithmetic number, because the mean of its divisors is an integer number (170088685).

Almost surely, 2^706522221 is an apocalyptic number.

It is an amenable number.

706522221 is a deficient number, since it is larger than the sum of its proper divisors (314009889).

706522221 is a wasteful number, since it uses less digits than its factorization.

706522221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78502475 (or 78502472 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 706522221 is about 26580.4857179097. The cubic root of 706522221 is about 890.6531505636.

Adding to 706522221 its reverse (122225607), we get a palindrome (828747828).

The spelling of 706522221 in words is "seven hundred six million, five hundred twenty-two thousand, two hundred twenty-one".