717713981 has 2 divisors, whose sum is σ = 717713982. Its totient is φ = 717713980.

The previous prime is 717713977. The next prime is 717713987. The reversal of 717713981 is 189317717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500416900 + 217297081 = 22370^2 + 14741^2 .

It is an emirp because it is prime and its reverse (189317717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 717713981 - 2² = 717713977 is a prime.

It is a super-2 number, since 2×717713981² = 1030226717045736722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717713987) 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, 358856990 + 358856991.

It is an arithmetic number, because the mean of its divisors is an integer number (358856991).

Almost surely, 2^717713981 is an apocalyptic number.

It is an amenable number.

717713981 is a deficient number, since it is larger than the sum of its proper divisors (1).

717713981 is an equidigital number, since it uses as much as digits as its factorization.

717713981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 44.

The square root of 717713981 is about 26790.1844151921. The cubic root of 717713981 is about 895.3313717346.

The spelling of 717713981 in words is "seven hundred seventeen million, seven hundred thirteen thousand, nine hundred eighty-one".