681181 has 8 divisors (see below), whose sum is σ = 715680. Its totient is φ = 647472.

The previous prime is 681179. The next prime is 681221. The reversal of 681181 is 181186.

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 681181 - 2¹ = 681179 is a prime.

It is a super-2 number, since 2×681181² = 928015109522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2266 + ... + 2548.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2⁶⁸¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

681181 is a deficient number, since it is larger than the sum of its proper divisors (34499).

681181 is a wasteful number, since it uses less digits than its factorization.

681181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 384, while the sum is 25.

The square root of 681181 is about 825.3369009077. The cubic root of 681181 is about 87.9874723902.

It can be divided in two parts, 68 and 1181, that multiplied together give a palindrome (80308).

The spelling of 681181 in words is "six hundred eighty-one thousand, one hundred eighty-one".