706721489 has 2 divisors, whose sum is σ = 706721490. Its totient is φ = 706721488.

The previous prime is 706721479. The next prime is 706721573. The reversal of 706721489 is 984127607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666930625 + 39790864 = 25825^2 + 6308^2 .

It is an emirp because it is prime and its reverse (984127607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 706721489 - 2⁸ = 706721233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (706721429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353360744 + 353360745.

It is an arithmetic number, because the mean of its divisors is an integer number (353360745).

Almost surely, 2^706721489 is an apocalyptic number.

It is an amenable number.

706721489 is a deficient number, since it is larger than the sum of its proper divisors (1).

706721489 is an equidigital number, since it uses as much as digits as its factorization.

706721489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 706721489 is about 26584.2338426369. The cubic root of 706721489 is about 890.7368761629.

The spelling of 706721489 in words is "seven hundred six million, seven hundred twenty-one thousand, four hundred eighty-nine".