681409201 has 24 divisors (see below), whose sum is σ = 808597440. Its totient is φ = 572029920.

The previous prime is 681409193. The next prime is 681409219. The reversal of 681409201 is 102904186.

It is a happy number.

It is not a de Polignac number, because 681409201 - 2³ = 681409193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681409241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76486 + ... + 84928.

It is an arithmetic number, because the mean of its divisors is an integer number (33691560).

Almost surely, 2^681409201 is an apocalyptic number.

It is an amenable number.

681409201 is a deficient number, since it is larger than the sum of its proper divisors (127188239).

681409201 is a wasteful number, since it uses less digits than its factorization.

681409201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517 (or 8506 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 681409201 is about 26103.8158321729. The cubic root of 681409201 is about 879.9729679196.

The spelling of 681409201 in words is "six hundred eighty-one million, four hundred nine thousand, two hundred one".