2305621 has 2 divisors, whose sum is σ = 2305622. Its totient is φ = 2305620.

The previous prime is 2305613. The next prime is 2305627. The reversal of 2305621 is 1265032.

It is a happy number.

2305621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2283121 + 22500 = 1511^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2305621 - 2³ = 2305613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2305627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1152810 + 1152811.

It is an arithmetic number, because the mean of its divisors is an integer number (1152811).

2^2305621 is an apocalyptic number.

It is an amenable number.

2305621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2305621 is an equidigital number, since it uses as much as digits as its factorization.

2305621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2305621 is about 1518.4271467542. The cubic root of 2305621 is about 132.1080573708.

It can be divided in two parts, 2305 and 621, that added together give a triangular number (2926 = T₇₆).

The spelling of 2305621 in words is "two million, three hundred five thousand, six hundred twenty-one".