1321603 has 8 divisors (see below), whose sum is σ = 1417248. Its totient is φ = 1229184.

The previous prime is 1321601. The next prime is 1321627. The reversal of 1321603 is 3061231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321603 - 2¹ = 1321601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 1627.

It is an arithmetic number, because the mean of its divisors is an integer number (177156).

2^1321603 is an apocalyptic number.

1321603 is a deficient number, since it is larger than the sum of its proper divisors (95645).

1321603 is a wasteful number, since it uses less digits than its factorization.

1321603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613.

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

The square root of 1321603 is about 1149.6099338471. The cubic root of 1321603 is about 109.7405178580.

Adding to 1321603 its reverse (3061231), we get a palindrome (4382834).

The spelling of 1321603 in words is "one million, three hundred twenty-one thousand, six hundred three".