1003641 has 4 divisors (see below), whose sum is σ = 1338192. Its totient is φ = 669092.

The previous prime is 1003631. The next prime is 1003679. The reversal of 1003641 is 1463001.

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 a cyclic number.

It is not a de Polignac number, because 1003641 - 2⁵ = 1003609 is a prime.

It is a D-number.

1003641 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1003641.

It is not an unprimeable number, because it can be changed into a prime (1003601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167271 + ... + 167276.

It is an arithmetic number, because the mean of its divisors is an integer number (334548).

2^1003641 is an apocalyptic number.

It is an amenable number.

1003641 is a deficient number, since it is larger than the sum of its proper divisors (334551).

1003641 is an equidigital number, since it uses as much as digits as its factorization.

1003641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334550.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1003641 is about 1001.8188458998. The cubic root of 1003641 is about 100.1212196652.

Adding to 1003641 its reverse (1463001), we get a palindrome (2466642).

It can be divided in two parts, 100 and 3641, that added together give a triangular number (3741 = T₈₆).

The spelling of 1003641 in words is "one million, three thousand, six hundred forty-one".