705902221 has 2 divisors, whose sum is σ = 705902222. Its totient is φ = 705902220.

The previous prime is 705902179. The next prime is 705902261. The reversal of 705902221 is 122209507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440538121 + 265364100 = 20989^2 + 16290^2 .

It is a cyclic number.

It is not a de Polignac number, because 705902221 - 2²⁹ = 169031309 is a prime.

It is a super-2 number, since 2×705902221² = 996595891225465682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 705902221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705902261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352951110 + 352951111.

It is an arithmetic number, because the mean of its divisors is an integer number (352951111).

Almost surely, 2^705902221 is an apocalyptic number.

It is an amenable number.

705902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

705902221 is an equidigital number, since it uses as much as digits as its factorization.

705902221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 705902221 is about 26568.8204668555. The cubic root of 705902221 is about 890.3925470314.

The spelling of 705902221 in words is "seven hundred five million, nine hundred two thousand, two hundred twenty-one".