681100 has 54 divisors (see below), whose sum is σ = 1731660. Its totient is φ = 231840.

The previous prime is 681091. The next prime is 681113. The reversal of 681100 is 1186.

681100 = T₂₁ + T₂₂ + ... + T₁₅₉.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4831 + ... + 4969.

2⁶⁸¹¹⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865830).

681100 is an abundant number, since it is smaller than the sum of its proper divisors (1050560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681100 is a wasteful number, since it uses less digits than its factorization.

681100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 681100 is about 825.2878285786. The cubic root of 681100 is about 87.9839846888.

Adding to 681100 its reverse (1186), we get a palindrome (682286).

The spelling of 681100 in words is "six hundred eighty-one thousand, one hundred".