1681441 has 4 divisors (see below), whose sum is σ = 1710000. Its totient is φ = 1652884.

The previous prime is 1681423. The next prime is 1681469. The reversal of 1681441 is 1441861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1441861 = 1009 ⋅1429.

It is a cyclic number.

It is not a de Polignac number, because 1681441 - 2⁹ = 1680929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14191 + ... + 14308.

It is an arithmetic number, because the mean of its divisors is an integer number (427500).

2^1681441 is an apocalyptic number.

It is an amenable number.

1681441 is a deficient number, since it is larger than the sum of its proper divisors (28559).

1681441 is an equidigital number, since it uses as much as digits as its factorization.

1681441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28558.

The product of its digits is 768, while the sum is 25.

The square root of 1681441 is about 1296.7038983515. The cubic root of 1681441 is about 118.9124181973.

Adding to 1681441 its product of digits (768), we get a square (1682209 = 1297²).

It can be divided in two parts, 1681 and 441, that multiplied together give a square (741321 = 861²).

The spelling of 1681441 in words is "one million, six hundred eighty-one thousand, four hundred forty-one".