706921 has 2 divisors, whose sum is σ = 706922. Its totient is φ = 706920.

The previous prime is 706919. The next prime is 706943. The reversal of 706921 is 129607.

706921 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., 360000 + 346921 = 600^2 + 589^2 .

It is an emirp because it is prime and its reverse (129607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 706921 - 2¹ = 706919 is a prime.

Together with 706919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (706961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353460 + 353461.

It is an arithmetic number, because the mean of its divisors is an integer number (353461).

2⁷⁰⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

706921 is a deficient number, since it is larger than the sum of its proper divisors (1).

706921 is an equidigital number, since it uses as much as digits as its factorization.

706921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 706921 is about 840.7859418425. The cubic root of 706921 is about 89.0820688097.

The spelling of 706921 in words is "seven hundred six thousand, nine hundred twenty-one".