681096709 has 4 divisors (see below), whose sum is σ = 681753280. Its totient is φ = 680440140.

The previous prime is 681096679. The next prime is 681096727. The reversal of 681096709 is 907690186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681096709 - 2¹⁵ = 681063941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681096509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326727 + ... + 328804.

It is an arithmetic number, because the mean of its divisors is an integer number (170438320).

Almost surely, 2^681096709 is an apocalyptic number.

It is an amenable number.

681096709 is a deficient number, since it is larger than the sum of its proper divisors (656571).

681096709 is a wasteful number, since it uses less digits than its factorization.

681096709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656570.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 681096709 is about 26097.8295840861. The cubic root of 681096709 is about 879.8384297896.

The spelling of 681096709 in words is "six hundred eighty-one million, ninety-six thousand, seven hundred nine".