2003641 has 2 divisors, whose sum is σ = 2003642. Its totient is φ = 2003640.

The previous prime is 2003633. The next prime is 2003647. The reversal of 2003641 is 1463002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1357225 + 646416 = 1165^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003641 - 2³ = 2003633 is a prime.

It is the 1416-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (2003647) by changing a digit.

It is a nontrivial repunit in base 1415.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001820 + 1001821.

It is an arithmetic number, because the mean of its divisors is an integer number (1001821).

2^2003641 is an apocalyptic number.

It is an amenable number.

2003641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003641 is an equidigital number, since it uses as much as digits as its factorization.

2003641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2003641 is about 1415.5002649240. The cubic root of 2003641 is about 126.0685148492.

Adding to 2003641 its reverse (1463002), we get a palindrome (3466643).

The spelling of 2003641 in words is "two million, three thousand, six hundred forty-one".