998723717 has 2 divisors, whose sum is σ = 998723718. Its totient is φ = 998723716.

The previous prime is 998723711. The next prime is 998723749. The reversal of 998723717 is 717327899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994393156 + 4330561 = 31534^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 998723717 - 2¹⁸ = 998461573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998723711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499361858 + 499361859.

It is an arithmetic number, because the mean of its divisors is an integer number (499361859).

Almost surely, 2^998723717 is an apocalyptic number.

It is an amenable number.

998723717 is a deficient number, since it is larger than the sum of its proper divisors (1).

998723717 is an equidigital number, since it uses as much as digits as its factorization.

998723717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 53.

The square root of 998723717 is about 31602.5903526910. The cubic root of 998723717 is about 999.5743912162.

The spelling of 998723717 in words is "nine hundred ninety-eight million, seven hundred twenty-three thousand, seven hundred seventeen".