681171017 has 2 divisors, whose sum is σ = 681171018. Its totient is φ = 681171016.

The previous prime is 681170993. The next prime is 681171019. The reversal of 681171017 is 710171186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398561296 + 282609721 = 19964^2 + 16811^2 .

It is a cyclic number.

It is not a de Polignac number, because 681171017 - 2¹² = 681166921 is a prime.

Together with 681171019, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_35327543 and since 681171017 and 35327543 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (681171019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340585508 + 340585509.

It is an arithmetic number, because the mean of its divisors is an integer number (340585509).

Almost surely, 2^681171017 is an apocalyptic number.

It is an amenable number.

681171017 is a deficient number, since it is larger than the sum of its proper divisors (1).

681171017 is an equidigital number, since it uses as much as digits as its factorization.

681171017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 32.

The square root of 681171017 is about 26099.2531885493. The cubic root of 681171017 is about 879.8704255672.

The spelling of 681171017 in words is "six hundred eighty-one million, one hundred seventy-one thousand, seventeen".