56305621 has 2 divisors, whose sum is σ = 56305622. Its totient is φ = 56305620.

The previous prime is 56305603. The next prime is 56305631. The reversal of 56305621 is 12650365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 2283121 = 7350^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 56305621 - 2¹¹ = 56303573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56305621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56305631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28152810 + 28152811.

It is an arithmetic number, because the mean of its divisors is an integer number (28152811).

Almost surely, 2^56305621 is an apocalyptic number.

It is an amenable number.

56305621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56305621 is an equidigital number, since it uses as much as digits as its factorization.

56305621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 56305621 is about 7503.7071504690. The cubic root of 56305621 is about 383.2809646587.

Adding to 56305621 its reverse (12650365), we get a palindrome (68955986).

The spelling of 56305621 in words is "fifty-six million, three hundred five thousand, six hundred twenty-one".