9745621 has 2 divisors, whose sum is σ = 9745622. Its totient is φ = 9745620.

The previous prime is 9745597. The next prime is 9745639. The reversal of 9745621 is 1265479.

9745621 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., 8910225 + 835396 = 2985^2 + 914^2 .

It is an emirp because it is prime and its reverse (1265479) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9745621 is a prime.

9745621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9745661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4872810 + 4872811.

It is an arithmetic number, because the mean of its divisors is an integer number (4872811).

Almost surely, 2^9745621 is an apocalyptic number.

It is an amenable number.

9745621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9745621 is an equidigital number, since it uses as much as digits as its factorization.

9745621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 9745621 is about 3121.7977192637. The cubic root of 9745621 is about 213.6009464368.

The spelling of 9745621 in words is "nine million, seven hundred forty-five thousand, six hundred twenty-one".