681406681 has 8 divisors (see below), whose sum is σ = 697656960. Its totient is φ = 665174832.

The previous prime is 681406669. The next prime is 681406703. The reversal of 681406681 is 186604186.

681406681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 681406681 - 2⁷ = 681406553 is a prime.

It is a super-2 number, since 2×681406681² = 928630129822871522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681406081) 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, 95856 + ... + 102718.

It is an arithmetic number, because the mean of its divisors is an integer number (87207120).

Almost surely, 2^681406681 is an apocalyptic number.

It is an amenable number.

681406681 is a deficient number, since it is larger than the sum of its proper divisors (16250279).

681406681 is a wasteful number, since it uses less digits than its factorization.

681406681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9215.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 681406681 is about 26103.7675633231. The cubic root of 681406681 is about 879.9718831409.

The spelling of 681406681 in words is "six hundred eighty-one million, four hundred six thousand, six hundred eighty-one".