706706221 has 4 divisors (see below), whose sum is σ = 761068252. Its totient is φ = 652344192.

The previous prime is 706706183. The next prime is 706706227. The reversal of 706706221 is 122607607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122607607 = 487 ⋅251761.

It can be written as a sum of positive squares in 2 ways, for example, as 121308196 + 585398025 = 11014^2 + 24195^2 .

It is a cyclic number.

It is not a de Polignac number, because 706706221 - 2²¹ = 704609069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706706227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27180996 + ... + 27181021.

It is an arithmetic number, because the mean of its divisors is an integer number (190267063).

Almost surely, 2^706706221 is an apocalyptic number.

It is an amenable number.

706706221 is a deficient number, since it is larger than the sum of its proper divisors (54362031).

706706221 is a wasteful number, since it uses less digits than its factorization.

706706221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54362030.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 706706221 is about 26583.9466783997. The cubic root of 706706221 is about 890.7304616282.

The spelling of 706706221 in words is "seven hundred six million, seven hundred six thousand, two hundred twenty-one".