705297221 has 2 divisors, whose sum is σ = 705297222. Its totient is φ = 705297220.

The previous prime is 705297217. The next prime is 705297239. The reversal of 705297221 is 122792507.

705297221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676728196 + 28569025 = 26014^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 705297221 - 2² = 705297217 is a prime.

It is a Sophie Germain 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 (705297721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352648610 + 352648611.

It is an arithmetic number, because the mean of its divisors is an integer number (352648611).

Almost surely, 2^705297221 is an apocalyptic number.

It is an amenable number.

705297221 is a deficient number, since it is larger than the sum of its proper divisors (1).

705297221 is an equidigital number, since it uses as much as digits as its factorization.

705297221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 705297221 is about 26557.4325001496. The cubic root of 705297221 is about 890.1381012815.

The spelling of 705297221 in words is "seven hundred five million, two hundred ninety-seven thousand, two hundred twenty-one".