1201603 has 4 divisors (see below), whose sum is σ = 1294048. Its totient is φ = 1109160.

The previous prime is 1201601. The next prime is 1201633. The reversal of 1201603 is 3061021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1201603 - 2¹ = 1201601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 92431 = 1201603 / (1 + 2 + 0 + 1 + 6 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201601) 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, 46203 + ... + 46228.

It is an arithmetic number, because the mean of its divisors is an integer number (323512).

2^1201603 is an apocalyptic number.

1201603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1201603 is a deficient number, since it is larger than the sum of its proper divisors (92445).

1201603 is an equidigital number, since it uses as much as digits as its factorization.

1201603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92444.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1201603 is about 1096.1765368772. The cubic root of 1201603 is about 106.3131536889.

Adding to 1201603 its reverse (3061021), we get a palindrome (4262624).

The spelling of 1201603 in words is "one million, two hundred one thousand, six hundred three".