2531603 has 4 divisors (see below), whose sum is σ = 2557800. Its totient is φ = 2505408.

The previous prime is 2531593. The next prime is 2531609. The reversal of 2531603 is 3061352.

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 2531603 - 2¹⁰ = 2530579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531609) 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, 12953 + ... + 13146.

It is an arithmetic number, because the mean of its divisors is an integer number (639450).

2^2531603 is an apocalyptic number.

2531603 is a deficient number, since it is larger than the sum of its proper divisors (26197).

2531603 is an equidigital number, since it uses as much as digits as its factorization.

2531603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26196.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 2531603 is about 1591.1011909995. The cubic root of 2531603 is about 136.2903794131.

Adding to 2531603 its reverse (3061352), we get a palindrome (5592955).

The spelling of 2531603 in words is "two million, five hundred thirty-one thousand, six hundred three".