1643241 has 4 divisors (see below), whose sum is σ = 2190992. Its totient is φ = 1095492.

The previous prime is 1643233. The next prime is 1643251. The reversal of 1643241 is 1423461.

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.

It is not a de Polignac number, because 1643241 - 2³ = 1643233 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643221) 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, 273871 + ... + 273876.

It is an arithmetic number, because the mean of its divisors is an integer number (547748).

2^1643241 is an apocalyptic number.

It is an amenable number.

1643241 is a deficient number, since it is larger than the sum of its proper divisors (547751).

1643241 is an equidigital number, since it uses as much as digits as its factorization.

1643241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547750.

The product of its digits is 576, while the sum is 21.

The square root of 1643241 is about 1281.8896208332. The cubic root of 1643241 is about 118.0050031394.

The spelling of 1643241 in words is "one million, six hundred forty-three thousand, two hundred forty-one".