681069681 has 16 divisors (see below), whose sum is σ = 1018792320. Its totient is φ = 449636400.

The previous prime is 681069637. The next prime is 681069707. The reversal of 681069681 is 186960186.

It is a happy number.

It is not a de Polignac number, because 681069681 - 2¹¹ = 681067633 is a prime.

It is a super-2 number, since 2×681069681² = 927711820754883522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681069481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119670 + ... + 125231.

It is an arithmetic number, because the mean of its divisors is an integer number (63674520).

Almost surely, 2^681069681 is an apocalyptic number.

It is an amenable number.

681069681 is a deficient number, since it is larger than the sum of its proper divisors (337722639).

681069681 is a wasteful number, since it uses less digits than its factorization.

681069681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245013 (or 245007 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 681069681 is about 26097.3117581103. The cubic root of 681069681 is about 879.8267914093.

The spelling of 681069681 in words is "six hundred eighty-one million, sixty-nine thousand, six hundred eighty-one".