1603201601 has 8 divisors (see below), whose sum is σ = 1647165480. Its totient is φ = 1559271168.

The previous prime is 1603201597. The next prime is 1603201603. The reversal of 1603201601 is 1061023061.

It is a Cunningham number, because it is equal to 40040²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1017610000 + 585591601 = 31900^2 + 24199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1603201601 - 2² = 1603201597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1603201603) 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 in 7 ways as a sum of consecutive naturals, for example, 112295 + ... + 125763.

It is an arithmetic number, because the mean of its divisors is an integer number (205895685).

Almost surely, 2^1603201601 is an apocalyptic number.

It is an amenable number.

1603201601 is a deficient number, since it is larger than the sum of its proper divisors (43963879).

1603201601 is a wasteful number, since it uses less digits than its factorization.

1603201601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16723.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1603201601 is about 40040.0000124875. Note that the first 4 decimals coincide. The cubic root of 1603201601 is about 1170.3867036934.

Adding to 1603201601 its reverse (1061023061), we get a palindrome (2664224662).

The spelling of 1603201601 in words is "one billion, six hundred three million, two hundred one thousand, six hundred one".