971585221 has 2 divisors, whose sum is σ = 971585222. Its totient is φ = 971585220.

The previous prime is 971585177. The next prime is 971585233. The reversal of 971585221 is 122585179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752130625 + 219454596 = 27425^2 + 14814^2 .

It is a cyclic number.

It is not a de Polignac number, because 971585221 - 2⁷ = 971585093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971585261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485792610 + 485792611.

It is an arithmetic number, because the mean of its divisors is an integer number (485792611).

Almost surely, 2^971585221 is an apocalyptic number.

It is an amenable number.

971585221 is a deficient number, since it is larger than the sum of its proper divisors (1).

971585221 is an equidigital number, since it uses as much as digits as its factorization.

971585221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 971585221 is about 31170.2618051244. The cubic root of 971585221 is about 990.4372523495.

The spelling of 971585221 in words is "nine hundred seventy-one million, five hundred eighty-five thousand, two hundred twenty-one".