681129 has 12 divisors (see below), whose sum is σ = 1020656. Its totient is φ = 453924.

The previous prime is 681127. The next prime is 681137. The reversal of 681129 is 921186.

It is not a de Polignac number, because 681129 - 2¹ = 681127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1159 + ... + 1644.

2⁶⁸¹¹²⁹ is an apocalyptic number.

It is an amenable number.

681129 is a deficient number, since it is larger than the sum of its proper divisors (339527).

681129 is an equidigital number, since it uses as much as digits as its factorization.

681129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818 (or 2806 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 681129 is about 825.3053980194. The cubic root of 681129 is about 87.9852334038.

It can be divided in two parts, 68112 and 9, that added together give a square (68121 = 261²).

The spelling of 681129 in words is "six hundred eighty-one thousand, one hundred twenty-nine".