247681 has 8 divisors (see below), whose sum is σ = 290304. Its totient is φ = 206880.

The previous prime is 247651. The next prime is 247691. The reversal of 247681 is 186742.

247681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 247681 - 2⁵ = 247649 is a prime.

It is a super-2 number, since 2×247681² = 122691755522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247601) 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, 145 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (36288).

2²⁴⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

247681 is a deficient number, since it is larger than the sum of its proper divisors (42623).

247681 is an equidigital number, since it uses as much as digits as its factorization.

247681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its digits is 2688, while the sum is 28.

The square root of 247681 is about 497.6755971514. The cubic root of 247681 is about 62.8006633059.

The spelling of 247681 in words is "two hundred forty-seven thousand, six hundred eighty-one".