717998881 has 2 divisors, whose sum is σ = 717998882. Its totient is φ = 717998880.

The previous prime is 717998861. The next prime is 717998903. The reversal of 717998881 is 188899717.

717998881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717382656 + 616225 = 26784^2 + 785^2 .

It is an emirp because it is prime and its reverse (188899717) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-717998881 is a prime.

It is a super-2 number, since 2×717998881² = 1031044786234504322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (717998861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358999440 + 358999441.

It is an arithmetic number, because the mean of its divisors is an integer number (358999441).

Almost surely, 2^717998881 is an apocalyptic number.

It is an amenable number.

717998881 is a deficient number, since it is larger than the sum of its proper divisors (1).

717998881 is an equidigital number, since it uses as much as digits as its factorization.

717998881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 58.

The square root of 717998881 is about 26795.5011335858. The cubic root of 717998881 is about 895.4498247537.

The spelling of 717998881 in words is "seven hundred seventeen million, nine hundred ninety-eight thousand, eight hundred eighty-one".