705206989 has 2 divisors, whose sum is σ = 705206990. Its totient is φ = 705206988.

The previous prime is 705206977. The next prime is 705207037. The reversal of 705206989 is 989602507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579990889 + 125216100 = 24083^2 + 11190^2 .

It is a cyclic number.

It is not a de Polignac number, because 705206989 - 2¹⁵ = 705174221 is a prime.

It is a super-2 number, since 2×705206989² = 994633794668892242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705206969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352603494 + 352603495.

It is an arithmetic number, because the mean of its divisors is an integer number (352603495).

Almost surely, 2^705206989 is an apocalyptic number.

It is an amenable number.

705206989 is a deficient number, since it is larger than the sum of its proper divisors (1).

705206989 is an equidigital number, since it uses as much as digits as its factorization.

705206989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 705206989 is about 26555.7336370133. The cubic root of 705206989 is about 890.1001398074.

The spelling of 705206989 in words is "seven hundred five million, two hundred six thousand, nine hundred eighty-nine".