681727201 has 6 divisors (see below), whose sum is σ = 719496402. Its totient is φ = 645846480.

The previous prime is 681727187. The next prime is 681727229. The reversal of 681727201 is 102727186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 386712225 + 295014976 = 19665^2 + 17176^2 .

It is not a de Polignac number, because 681727201 - 2¹¹ = 681725153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681727271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 943860 + ... + 944581.

It is an arithmetic number, because the mean of its divisors is an integer number (119916067).

Almost surely, 2^681727201 is an apocalyptic number.

It is an amenable number.

681727201 is a deficient number, since it is larger than the sum of its proper divisors (37769201).

681727201 is a wasteful number, since it uses less digits than its factorization.

681727201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888479 (or 1888460 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 681727201 is about 26109.9061852010. The cubic root of 681727201 is about 880.1098352059.

The spelling of 681727201 in words is "six hundred eighty-one million, seven hundred twenty-seven thousand, two hundred one".