681249 has 8 divisors (see below), whose sum is σ = 929632. Its totient is φ = 443520.

The previous prime is 681229. The next prime is 681251. The reversal of 681249 is 942186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681249 - 2⁸ = 680993 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (681229) 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, 2512 + ... + 2769.

It is an arithmetic number, because the mean of its divisors is an integer number (116204).

2⁶⁸¹²⁴⁹ is an apocalyptic number.

It is an amenable number.

681249 is a deficient number, since it is larger than the sum of its proper divisors (248383).

681249 is a wasteful number, since it uses less digits than its factorization.

681249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327.

The product of its digits is 3456, while the sum is 30.

The square root of 681249 is about 825.3780951782. The cubic root of 681249 is about 87.9904001236.

The spelling of 681249 in words is "six hundred eighty-one thousand, two hundred forty-nine".