1606603 has 2 divisors, whose sum is σ = 1606604. Its totient is φ = 1606602.

The previous prime is 1606597. The next prime is 1606639. The reversal of 1606603 is 3066061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1606643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803301 + 803302.

It is an arithmetic number, because the mean of its divisors is an integer number (803302).

2^1606603 is an apocalyptic number.

1606603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606603 is an equidigital number, since it uses as much as digits as its factorization.

1606603 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 1606603 is about 1267.5184416804. The cubic root of 1606603 is about 117.1213827807.

It can be divided in two parts, 1606 and 603, that added together give a square (2209 = 47²).

The spelling of 1606603 in words is "one million, six hundred six thousand, six hundred three".