716981 has 2 divisors, whose sum is σ = 716982. Its totient is φ = 716980.

The previous prime is 716959. The next prime is 716987. The reversal of 716981 is 189617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 62500 = 809^2 + 250^2 .

It is an emirp because it is prime and its reverse (189617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 716981 - 2⁶ = 716917 is a prime.

It is a super-2 number, since 2×716981² = 1028123508722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 716981.

It is not a weakly prime, because it can be changed into another prime (716987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358490 + 358491.

It is an arithmetic number, because the mean of its divisors is an integer number (358491).

2⁷¹⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

716981 is a deficient number, since it is larger than the sum of its proper divisors (1).

716981 is an equidigital number, since it uses as much as digits as its factorization.

716981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 716981 is about 846.7473058711. The cubic root of 716981 is about 89.5026475710.

The spelling of 716981 in words is "seven hundred sixteen thousand, nine hundred eighty-one".