975809221 has 2 divisors, whose sum is σ = 975809222. Its totient is φ = 975809220.

The previous prime is 975809189. The next prime is 975809249. The reversal of 975809221 is 122908579.

975809221 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., 549386721 + 426422500 = 23439^2 + 20650^2 .

It is a cyclic number.

It is not a de Polignac number, because 975809221 - 2⁵ = 975809189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975809921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487904610 + 487904611.

It is an arithmetic number, because the mean of its divisors is an integer number (487904611).

Almost surely, 2^975809221 is an apocalyptic number.

It is an amenable number.

975809221 is a deficient number, since it is larger than the sum of its proper divisors (1).

975809221 is an equidigital number, since it uses as much as digits as its factorization.

975809221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 975809221 is about 31237.9452109130. The cubic root of 975809221 is about 991.8704972752.

The spelling of 975809221 in words is "nine hundred seventy-five million, eight hundred nine thousand, two hundred twenty-one".