2003454521 has 2 divisors, whose sum is σ = 2003454522. Its totient is φ = 2003454520.

The previous prime is 2003454517. The next prime is 2003454527. The reversal of 2003454521 is 1254543002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1344248896 + 659205625 = 36664^2 + 25675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003454521 - 2² = 2003454517 is a prime.

It is not a weakly prime, because it can be changed into another prime (2003454527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001727260 + 1001727261.

It is an arithmetic number, because the mean of its divisors is an integer number (1001727261).

Almost surely, 2^2003454521 is an apocalyptic number.

It is an amenable number.

2003454521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003454521 is an equidigital number, since it uses as much as digits as its factorization.

2003454521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2003454521 is about 44759.9656054381. The cubic root of 2003454521 is about 1260.6460365955.

Adding to 2003454521 its reverse (1254543002), we get a palindrome (3257997523).

The spelling of 2003454521 in words is "two billion, three million, four hundred fifty-four thousand, five hundred twenty-one".