1601603 has 4 divisors (see below), whose sum is σ = 1604688. Its totient is φ = 1598520.

The previous prime is 1601599. The next prime is 1601609. The reversal of 1601603 is 3061061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061061 = 863 ⋅3547.

It is a cyclic number.

It is not a de Polignac number, because 1601603 - 2² = 1601599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551 + ... + 1872.

It is an arithmetic number, because the mean of its divisors is an integer number (401172).

2^1601603 is an apocalyptic number.

1601603 is a deficient number, since it is larger than the sum of its proper divisors (3085).

1601603 is an equidigital number, since it uses as much as digits as its factorization.

1601603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1601603 is about 1265.5445468256. The cubic root of 1601603 is about 116.9997564950. Note that the first 3 decimals are identical.

Adding to 1601603 its reverse (3061061), we get a palindrome (4662664).

The spelling of 1601603 in words is "one million, six hundred one thousand, six hundred three".