705923919721 has 2 divisors, whose sum is σ = 705923919722. Its totient is φ = 705923919720.

The previous prime is 705923919719. The next prime is 705923919731. The reversal of 705923919721 is 127919329507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500465694096 + 205458225625 = 707436^2 + 453275^2 .

It is an emirp because it is prime and its reverse (127919329507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705923919721 - 2¹ = 705923919719 is a prime.

Together with 705923919719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (705923919731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352961959860 + 352961959861.

It is an arithmetic number, because the mean of its divisors is an integer number (352961959861).

Almost surely, 2^705923919721 is an apocalyptic number.

It is an amenable number.

705923919721 is a deficient number, since it is larger than the sum of its proper divisors (1).

705923919721 is an equidigital number, since it uses as much as digits as its factorization.

705923919721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The spelling of 705923919721 in words is "seven hundred five billion, nine hundred twenty-three million, nine hundred nineteen thousand, seven hundred twenty-one".