1603313 has 4 divisors (see below), whose sum is σ = 1619940. Its totient is φ = 1586688.

The previous prime is 1603297. The next prime is 1603319. The reversal of 1603313 is 3133061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3133061 = 79 ⋅39659.

It can be written as a sum of positive squares in 2 ways, for example, as 1129969 + 473344 = 1063^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1603313 - 2⁴ = 1603297 is a prime.

It is a super-2 number, since 2×1603313² = 5141225151938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1603291 and 1603300.

It is not an unprimeable number, because it can be changed into a prime (1603319) 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, 8168 + ... + 8361.

It is an arithmetic number, because the mean of its divisors is an integer number (404985).

2^1603313 is an apocalyptic number.

It is an amenable number.

1603313 is a deficient number, since it is larger than the sum of its proper divisors (16627).

1603313 is an equidigital number, since it uses as much as digits as its factorization.

1603313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1603313 is about 1266.2199650930. The cubic root of 1603313 is about 117.0413811303.

Adding to 1603313 its reverse (3133061), we get a palindrome (4736374).

The spelling of 1603313 in words is "one million, six hundred three thousand, three hundred thirteen".