681395 has 16 divisors (see below), whose sum is σ = 961632. Its totient is φ = 456960.

The previous prime is 681371. The next prime is 681403. The reversal of 681395 is 593186.

It is not a de Polignac number, because 681395 - 2¹⁴ = 665011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 239 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (60102).

2⁶⁸¹³⁹⁵ is an apocalyptic number.

681395 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

681395 is a deficient number, since it is larger than the sum of its proper divisors (280237).

681395 is a wasteful number, since it uses less digits than its factorization.

681395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 6480, while the sum is 32.

The square root of 681395 is about 825.4665347547. The cubic root of 681395 is about 87.9966854812.

Subtracting from 681395 its reverse (593186), we obtain a square (88209 = 297²).

The spelling of 681395 in words is "six hundred eighty-one thousand, three hundred ninety-five".