2603681 has 2 divisors, whose sum is σ = 2603682. Its totient is φ = 2603680.

The previous prime is 2603677. The next prime is 2603701. The reversal of 2603681 is 1863062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 43681 = 1600^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2603681 - 2² = 2603677 is a prime.

It is a super-2 number, since 2×2603681² = 13558309499522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2603681.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2603621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301840 + 1301841.

It is an arithmetic number, because the mean of its divisors is an integer number (1301841).

2^2603681 is an apocalyptic number.

It is an amenable number.

2603681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2603681 is an equidigital number, since it uses as much as digits as its factorization.

2603681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2603681 is about 1613.5925755903. The cubic root of 2603681 is about 137.5717487802.

The spelling of 2603681 in words is "two million, six hundred three thousand, six hundred eighty-one".