2603981 has 2 divisors, whose sum is σ = 2603982. Its totient is φ = 2603980.

The previous prime is 2603933. The next prime is 2604011. The reversal of 2603981 is 1893062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 11881 = 1610^2 + 109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2603981 is a prime.

It is a super-2 number, since 2×2603981² = 13561434096722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2603911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301990 + 1301991.

It is an arithmetic number, because the mean of its divisors is an integer number (1301991).

2^2603981 is an apocalyptic number.

It is an amenable number.

2603981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2603981 is an equidigital number, since it uses as much as digits as its factorization.

2603981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2603981 is about 1613.6855331817. The cubic root of 2603981 is about 137.5770323178.

The spelling of 2603981 in words is "two million, six hundred three thousand, nine hundred eighty-one".