2603921 has 2 divisors, whose sum is σ = 2603922. Its totient is φ = 2603920.

The previous prime is 2603911. The next prime is 2603927. The reversal of 2603921 is 1293062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 819025 = 1336^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2603921 - 2⁶ = 2603857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2603927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301960 + 1301961.

It is an arithmetic number, because the mean of its divisors is an integer number (1301961).

2^2603921 is an apocalyptic number.

It is an amenable number.

2603921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2603921 is an equidigital number, since it uses as much as digits as its factorization.

2603921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2603921 is about 1613.6669420918. Note that the first 3 decimals coincide. The cubic root of 2603921 is about 137.5759756428.

Adding to 2603921 its reverse (1293062), we get a palindrome (3896983).

The spelling of 2603921 in words is "two million, six hundred three thousand, nine hundred twenty-one".