681237 has 16 divisors (see below), whose sum is σ = 1054080. Its totient is φ = 434016.

The previous prime is 681229. The next prime is 681251. The reversal of 681237 is 732186.

It is not a de Polignac number, because 681237 - 2³ = 681229 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 681237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (65880).

2⁶⁸¹²³⁷ is an apocalyptic number.

It is an amenable number.

681237 is a deficient number, since it is larger than the sum of its proper divisors (372843).

681237 is a wasteful number, since it uses less digits than its factorization.

681237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1123 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 681237 is about 825.3708257505. The cubic root of 681237 is about 87.9898834789.

The spelling of 681237 in words is "six hundred eighty-one thousand, two hundred thirty-seven".