1603728493 has 2 divisors, whose sum is σ = 1603728494. Its totient is φ = 1603728492.

The previous prime is 1603728443. The next prime is 1603728509. The reversal of 1603728493 is 3948273061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1502182564 + 101545929 = 38758^2 + 10077^2 .

It is an emirp because it is prime and its reverse (3948273061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1603728493 - 2⁹ = 1603727981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1603728403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801864246 + 801864247.

It is an arithmetic number, because the mean of its divisors is an integer number (801864247).

Almost surely, 2^1603728493 is an apocalyptic number.

It is an amenable number.

1603728493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603728493 is an equidigital number, since it uses as much as digits as its factorization.

1603728493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1603728493 is about 40046.5790424101. The cubic root of 1603728493 is about 1170.5149054631.

The spelling of 1603728493 in words is "one billion, six hundred three million, seven hundred twenty-eight thousand, four hundred ninety-three".