681213701 has 16 divisors (see below), whose sum is σ = 813897984. Its totient is φ = 557466624.

The previous prime is 681213679. The next prime is 681213713. The reversal of 681213701 is 107312186.

681213701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681213701 - 2¹⁰ = 681212677 is a prime.

It is a super-3 number, since 3×681213701³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681213721) 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, 89231 + ... + 96563.

It is an arithmetic number, because the mean of its divisors is an integer number (50868624).

Almost surely, 2^681213701 is an apocalyptic number.

It is an amenable number.

681213701 is a deficient number, since it is larger than the sum of its proper divisors (132684283).

681213701 is a wasteful number, since it uses less digits than its factorization.

681213701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 681213701 is about 26100.0709002868. The cubic root of 681213701 is about 879.8888035290. Note that the first 4 decimals are identical.

Adding to 681213701 its reverse (107312186), we get a palindrome (788525887).

The spelling of 681213701 in words is "six hundred eighty-one million, two hundred thirteen thousand, seven hundred one".