2003608561 has 2 divisors, whose sum is σ = 2003608562. Its totient is φ = 2003608560.

The previous prime is 2003608547. The next prime is 2003608567. The reversal of 2003608561 is 1658063002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1577598961 + 426009600 = 39719^2 + 20640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003608561 - 2²¹ = 2001511409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2003608567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001804280 + 1001804281.

It is an arithmetic number, because the mean of its divisors is an integer number (1001804281).

Almost surely, 2^2003608561 is an apocalyptic number.

It is an amenable number.

2003608561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003608561 is an equidigital number, since it uses as much as digits as its factorization.

2003608561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2003608561 is about 44761.6863064831. The cubic root of 2003608561 is about 1260.6783449470.

The spelling of 2003608561 in words is "two billion, three million, six hundred eight thousand, five hundred sixty-one".