1681243 has 4 divisors (see below), whose sum is σ = 1726720. Its totient is φ = 1635768.

The previous prime is 1681241. The next prime is 1681247. The reversal of 1681243 is 3421861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1681243 - 2¹ = 1681241 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8 + 1 + 2⁹ + 4⁵ + 3⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22683 + ... + 22756.

It is an arithmetic number, because the mean of its divisors is an integer number (431680).

2^1681243 is an apocalyptic number.

1681243 is a deficient number, since it is larger than the sum of its proper divisors (45477).

1681243 is an equidigital number, since it uses as much as digits as its factorization.

1681243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45476.

The product of its digits is 1152, while the sum is 25.

The square root of 1681243 is about 1296.6275486816. The cubic root of 1681243 is about 118.9077504584.

The spelling of 1681243 in words is "one million, six hundred eighty-one thousand, two hundred forty-three".