1213603 has 4 divisors (see below), whose sum is σ = 1230768. Its totient is φ = 1196440.

The previous prime is 1213601. The next prime is 1213607. The reversal of 1213603 is 3063121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213603 - 2¹ = 1213601 is a prime.

It is a Duffinian number.

1213603 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1213601) 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, 8476 + ... + 8617.

It is an arithmetic number, because the mean of its divisors is an integer number (307692).

2^1213603 is an apocalyptic number.

1213603 is a deficient number, since it is larger than the sum of its proper divisors (17165).

1213603 is an equidigital number, since it uses as much as digits as its factorization.

1213603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17164.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1213603 is about 1101.6365099251. The cubic root of 1213603 is about 106.6658864960.

Adding to 1213603 its reverse (3063121), we get a palindrome (4276724).

The spelling of 1213603 in words is "one million, two hundred thirteen thousand, six hundred three".