8425621 has 2 divisors, whose sum is σ = 8425622. Its totient is φ = 8425620.

The previous prime is 8425589. The next prime is 8425657. The reversal of 8425621 is 1265248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6426225 + 1999396 = 2535^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 8425621 - 2⁵ = 8425589 is a prime.

8425621 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8425621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8425691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4212810 + 4212811.

It is an arithmetic number, because the mean of its divisors is an integer number (4212811).

Almost surely, 2^8425621 is an apocalyptic number.

It is an amenable number.

8425621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8425621 is an equidigital number, since it uses as much as digits as its factorization.

8425621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 8425621 is about 2902.6920263783. The cubic root of 8425621 is about 203.4857369161.

The spelling of 8425621 in words is "eight million, four hundred twenty-five thousand, six hundred twenty-one".