681507017 has 8 divisors (see below), whose sum is σ = 684174600. Its totient is φ = 678845440.

The previous prime is 681507011. The next prime is 681507023. The reversal of 681507017 is 710705186.

It is an interprime number because it is at equal distance from previous prime (681507011) and next prime (681507023).

It can be written as a sum of positive squares in 4 ways, for example, as 199967881 + 481539136 = 14141^2 + 21944^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681507017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681507011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421703 + ... + 423315.

It is an arithmetic number, because the mean of its divisors is an integer number (85521825).

Almost surely, 2^681507017 is an apocalyptic number.

It is an amenable number.

681507017 is a deficient number, since it is larger than the sum of its proper divisors (2667583).

681507017 is a wasteful number, since it uses less digits than its factorization.

681507017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 681507017 is about 26105.6893607505. The cubic root of 681507017 is about 880.0150724863.

The spelling of 681507017 in words is "six hundred eighty-one million, five hundred seven thousand, seventeen".