681161 has 8 divisors (see below), whose sum is σ = 740544. Its totient is φ = 622800.

The previous prime is 681151. The next prime is 681167. The reversal of 681161 is 161186.

It is a happy number.

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 681161 - 2¹⁴ = 664777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681167) 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, 1790 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (92568).

2⁶⁸¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

681161 is a deficient number, since it is larger than the sum of its proper divisors (59383).

681161 is a wasteful number, since it uses less digits than its factorization.

681161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its digits is 288, while the sum is 23.

The square root of 681161 is about 825.3247845545. The cubic root of 681161 is about 87.9866112551.

The spelling of 681161 in words is "six hundred eighty-one thousand, one hundred sixty-one".