681265 has 16 divisors (see below), whose sum is σ = 903168. Its totient is φ = 490176.

The previous prime is 681259. The next prime is 681271. The reversal of 681265 is 562186.

It is an interprime number because it is at equal distance from previous prime (681259) and next prime (681271).

It is a cyclic number.

It is not a de Polignac number, because 681265 - 2³ = 681257 is a prime.

It is a Duffinian number.

681265 is a Rhonda number in base 8 and base 10.

Its product of digits (2880) is a multiple of the sum of its prime divisors (288).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2944 + ... + 3166.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2⁶⁸¹²⁶⁵ is an apocalyptic number.

681265 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681265 is a deficient number, since it is larger than the sum of its proper divisors (221903).

681265 is a wasteful number, since it uses less digits than its factorization.

681265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its digits is 2880, while the sum is 28.

The square root of 681265 is about 825.3877876489. The cubic root of 681265 is about 87.9910889737.

It can be divided in two parts, 681 and 265, that added together give a triangular number (946 = T₄₃).

The spelling of 681265 in words is "six hundred eighty-one thousand, two hundred sixty-five".