1603201603 has 2 divisors, whose sum is σ = 1603201604. Its totient is φ = 1603201602.

The previous prime is 1603201597. The next prime is 1603201657. The reversal of 1603201603 is 3061023061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1603201603 - 2⁵ = 1603201571 is a prime.

It is not a weakly prime, because it can be changed into another prime (1603201903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801600801 + 801600802.

It is an arithmetic number, because the mean of its divisors is an integer number (801600802).

Almost surely, 2^1603201603 is an apocalyptic number.

1603201603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603201603 is an equidigital number, since it uses as much as digits as its factorization.

1603201603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1603201603 is about 40040.0000374625. Note that the first 4 decimals coincide. The cubic root of 1603201603 is about 1170.3867041801.

Adding to 1603201603 its reverse (3061023061), we get a palindrome (4664224664).

The spelling of 1603201603 in words is "one billion, six hundred three million, two hundred one thousand, six hundred three".