708541721 has 2 divisors, whose sum is σ = 708541722. Its totient is φ = 708541720.

The previous prime is 708541709. The next prime is 708541777. The reversal of 708541721 is 127145807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657204496 + 51337225 = 25636^2 + 7165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-708541721 is a prime.

It is not a weakly prime, because it can be changed into another prime (708541321) 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, 354270860 + 354270861.

It is an arithmetic number, because the mean of its divisors is an integer number (354270861).

Almost surely, 2^708541721 is an apocalyptic number.

It is an amenable number.

708541721 is a deficient number, since it is larger than the sum of its proper divisors (1).

708541721 is an equidigital number, since it uses as much as digits as its factorization.

708541721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 708541721 is about 26618.4470057890. The cubic root of 708541721 is about 891.5009479121.

The spelling of 708541721 in words is "seven hundred eight million, five hundred forty-one thousand, seven hundred twenty-one".