709649 has 2 divisors, whose sum is σ = 709650. Its totient is φ = 709648.

The previous prime is 709609. The next prime is 709651. The reversal of 709649 is 946907.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 37249 = 820^2 + 193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-709649 is a prime.

Together with 709651, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (709609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354824 + 354825.

It is an arithmetic number, because the mean of its divisors is an integer number (354825).

2⁷⁰⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

709649 is a deficient number, since it is larger than the sum of its proper divisors (1).

709649 is an equidigital number, since it uses as much as digits as its factorization.

709649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 709649 is about 842.4066713886. The cubic root of 709649 is about 89.1965106185.

The spelling of 709649 in words is "seven hundred nine thousand, six hundred forty-nine".