9575420821 has 2 divisors, whose sum is σ = 9575420822. Its totient is φ = 9575420820.

The previous prime is 9575420797. The next prime is 9575420849. The reversal of 9575420821 is 1280245759.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9445118596 + 130302225 = 97186^2 + 11415^2 .

It is a cyclic number.

It is not a de Polignac number, because 9575420821 - 2⁷ = 9575420693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9579420821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4787710410 + 4787710411.

It is an arithmetic number, because the mean of its divisors is an integer number (4787710411).

Almost surely, 2^9575420821 is an apocalyptic number.

It is an amenable number.

9575420821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9575420821 is an equidigital number, since it uses as much as digits as its factorization.

9575420821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 9575420821 is about 97854.0792251401. The cubic root of 9575420821 is about 2123.5017495957.

The spelling of 9575420821 in words is "nine billion, five hundred seventy-five million, four hundred twenty thousand, eight hundred twenty-one".